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Adams, J.I. and Hayes, D.C., 1967. The Uplift Capacity of Shallow Foundations. Ontario Hydro Research Quarterly, Vol. 19, No. 1, pp. 1-13.

Adams, J.I. and Klym, T.W., 1972. A Study of Anchors for Transmission Tower Foundations. Canadian Geotechnical Journal, Vol. 9, No. 1, pp. 89-104.

Black, D.R. and Pack, J.S., 2002. Design and Performance of Helical Screw Piles in Collapsible and Expansive Soils in Arid Regions of the United States. Proceedings of the 9th International Conference on Piling and Deep Foundations, pp. 469-476.

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Ghaly, A.M., 1996. closure to Drivability and Pullout Resistance of Helical Units in Saturated Sands. Soils and Foundations, Vol. 36, No. 2, pp.139-141.

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Ghaly, A.M. and Clemence, S.P., 1999. closure to Pullout Performance of Inclined Helical Screw Anchors in Sand. Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol. 125, No. 12, pp. 1102-1104.

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Ghaly, A.M. and Hanna, A.M, 1992. Stress and Strains Around Helical Screw Anchors in Sand. Soils and Foundations, Vol. 32, No. 4, pp. 27-42.

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Ghaly, A.M. and Hanna, A., 1994. Ultimate Pullout Resistance of Single Vertical Anchors. Canadian Geotechnical Journal, Vol. 31, No. 5, pp. 661-672.

Ghaly, A.M. and Hanna, A., 1994. Ultimate Pullout Resistance of Groups of Vertical Anchors. Canadian Geotechnical Journal, Vol. 31, No. 5, pp. 673-682.

Ghaly, A.M. and Hanna, A., 1995. closure to Ultimate Pullout Resistance of Single Vertical Anchors. Canadian Geotechnical Journal, Vol. 32, No. 6, pp. 1093-1094.

Ghaly, A.M., Hanna, A.M. and Hanna, M.S., 1991. Uplift Behavior of Screw Anchors in Sand - I: Dry Sand. Journal of Geotechnical Engineering, ASCE, Vol. 117, No. 5, pp. 773-793.

Ghaly, A.M., Hanna, A.M. and Hanna, M.S., 1991. Uplift Behavior of Screw Anchors in Sand - II: Hydrostatic and Flow Conditions. Journal of Geotechnical Engineering, ASCE, Vol. 117, No. 5, pp. 794-808.

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 Ghaly, A., Hanna, A., Ranjan, G. and Hanna, M., 1991. Helical Anchors in Dry and Submerged Sand Subjected to Surcharge. Journal of Geotechnical Engineering, ASCE, Vol. 117, No. 10, pp. 1463-1470.

Ghaly, A., Hanna, A., Ranjan, G. and Hanna, M., 1993. closure to Helical Anchors in Dry and Submerged Sand Subjected to Surcharge. Journal of Geotechnical Engineering, ASCE, Vol. 119, No. 2, pp. 392-394.

Goldsworth, J.S., Jaksa, M.B., Kaggwa, W.S., Fenton, G.A., Griffiths, D.V. and Poulos, H.G., 2004. Cost of Foundation Failures Due to Limited Site Investigations. International Conference on Structural and Foundation Failures, Singapore.

Gunnink, Brett; Gammon, Scott; Barker, Michael; Berry, Ron, 1995.  A Finite Element Approach to the Buckling Behavior of Helical Soil Piers.  Engineering Mechanics (1995) 1995.  ASCE

Hanna, A. and Ghaly, A., 1992. Effects of Ko and Overconsolidation on Uplift Capacity. Journal of Geotechnical Engineering, ASCE, Vol. 118, No. 9, pp. 1449-1469.

Hanna, A. and Ghaly, A., 1994. Ultimate Pullout Resistance of Groups of Vertical Anchors. Canadian Geotechnical Journal, Vol. 31, No. 5, pp. 673-682.

Hargrave, R.L. and Thorsten, R.E., 1992. Helical Piers in Expansive Soils of Dallas, Texas. Proceedings of the 7th International Conference on Expansive Soils.

Hovland, H.J., 1993. Discussion of Helical Anchors in Dry and Submerged Sand Subjected to Surcharge. Journal of Geotechnical Engineering, ASCE, Vol. 119, No. 2, pp. 391-392.

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Hoyt, R., Seider, G., Reese, L.C., and Wang, S.T., 1995. Buckling of Helical Anchors Used for Underpinning. Foundation Upgrading and Repair for Infrastructure Improvement, ASCE, pp. 89-108.

Huang, F.C., Mohmood, I., Joolazadeh, M., and Axten, G.W., 1995. Design Considerations and Field Load Tests of a Helical Anchoring System for Foundation Renovation. Foundation Upgrading and Repair for Infrastructure Improvement, ASCE, pp. 76-88.

Jennings, R. and Bobbitt, D., 2003. Helical Pulldown Micropiles Support Museum Celebrating the Bicentennial of the Lewis and Clark Expedition. Proceedings of 28th Annual Conference on Deep Foundations, DFI, pp. 285-290.

Johnston, G.H. and Ladanyi, B., 1974. Field Tests of Deep Power-Installed Screw Anchors in Permafrost. Canadian Geotechnical Journal, Vol. 11, No. 3, pp. 348-359.

Ryan J. Johnston; Douglas N. Swanston; F. W. “Bill” Baxandall.  1999.  Helical Piling Foundations in Juneau, Alaska.  Cold Regions Engineering: Putting Research into Practice 1999.

Khatri, D. and Stringer, S., 2003. Helical Pile Foundation Anchors as a Practical Alternative. Proceedings of 28th Annual Conference on Deep Foundations, DFI, pp. 299-308.

J. Ledlie Klosky; Stein Sture; Hon-Yim Ko; Frank Barnes, 1998.  Helical Anchors for Combined Anchoring and Soil Testing in Lunar Operations.  Space 98 1998.  ASCE

Klym, T.W., Radhakrishna, H.S., and Howard, K., 19??. Helical Plate Anchors for Tower Foundations. Proceedings of the 25th Canadian Geotechnical Conference, pp. 141-159.

Kraft, D.C., Davis, J. And Raaf, D.B., 2003. Use of Helical Piles Set into Soft Rock for 1500-Ton Screw Press Foundation. Proceedings of 28th Annual Conference on Deep Foundations, DFI, pp. 209-218.

Kumar, J., 1995. discussion of Ultimate Pullout Resistance of Single Vertical Anchors.  Canadian Geotechnical Journal, Vol. 32, No. 6, p. 1093

Levesque, C.L., Wheaton, D.E. and Valsangkar, A.J., 2003. Centrifuge Modeling of Helical Anchors in Sand. Proceedings of the 12th Panamerican Conference on Soil Mechanics and Foundation Engineering.

Liu, H., Zubeck, H., and Baginski, S., 1999.  Evaluation of Helical Piers in Frozen Ground.  Cold Regions Engineering: Putting Research into Practice 1999

Lutenegger, A.J., Smith, B.L. and Kabir, M.G., 1988. Use of In Situ Tests to Predict Uplift Performance of Multi-Helix Anchors. Special Topics in Foundations, ASCE, pp. 93-110.

McDonald, J.K., 1999. Discussion of Pullout Performance of Inclined Helical Screw Anchors in Sand. Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol. 125, No. 12, p. 1102.

Meyerhoff, G. Geoffery, 1994. Evolution of Safety Factors and Geotechnical State Limit Design.  Proceedings of the Second Spencer J. Buchanan Lecture, Texas A&M University.

Mitsch, M.P. and Clemence, S.P., 1985. The Uplift Capacity of Helix Anchors and Sand. Uplift Behavior of Anchor Foundations in Soil, ASCE, pp. 26-47.

Mooney, J.S., Adamczak, S.Jr., and Clemence, S.P., 1985. Uplift Capacity of Helix Anchors in Clay and Silt. Uplift Behavior of Anchor Foundations in Soil, ASCE, pp. 48-72.

Narasimha Rao, .S., Prasad, Y.V.S.N., Shetty, M.D. and Joshi, V.V., 1989. Uplift Capacity of Screw Pile Anchors. Geotechnical Engineering, Vol. 20, No. 2, pp. 139-159.

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Narasimha Rao, S. and Prasad, Y.V.S.N., 1993. Estimation of Uplift Capacity of Helical Anchors in Clays. Journal of Geotechnical Engineering, ASCE, Vol. 119, No. 2, pp. 352-357.

Narasimha Rao, S., Prasad, Y.V.S.N. and Veeresh, C., 1993. Behavior of Embedded Model Screw Anchors in Soft Clays. Geotechnique, Vol. 43, No. 4, pp. 605-614.

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Nasr, Mamdouh H.,  2004. Large Capacity Screw Piles. Presented at International Conference: Future Vision and Challenges for Urban Development, Cairo Egypt.

Pack, J.S., 2000. Design of Helical Piles for Heavily Loaded Structures. New Technological and Design Developments in Deep Foundations, ASCE, pp. 353-367.

Pack, J.S., 2003. Helical Foundation and Tiebacks: Quality Control, Inspection and Performance Monitoring. Proceedings of 28th Annual Conference on Deep Foundations, DFI, pp. 269 - 284.

Pack, J.S. and McNeill, K.M., 2003. Square Shaft Helical Screw Piles in Expansive Clay Areas. Proceedings of the 12th Panamerican Conference on Soil Mechanics and Foundation Engineering.

Palmer, A.C. et al. 2003.  Uplift Resistance of Buried Submarine Pipelines: comparison between centrifuge modelling and full scale tests.

Perko, H.A. (2004) “Introduction to Corrosion and Galvanizing of Helix Foundations” . Technical Reference Guide, Engineering Analysis, Section 3.  Presented at Helical Foundations & Tiebacks Specialty Seminar, DFI, Tampa FL

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Perko, H.A. (2003) "Lateral Capacity and Buckling Resistance of Helix Pier Foundations". Presented at Foundations Technology Seminar, DFI, University of Cincinnati.

Perko, H.A., 2000. Energy Method for Predicting the Installation Torque of Helical Foundations and Anchors. New Technological and Design Developments in Deep Foundations, ASCE, pp. 342-352.

Perko, H.A., 2005. "Underpinning and Shoring for Underground MRI Research Facility at Ohio State University".  ASCE, New York, NY.

Prasad, Y.V.S.N. and Narasimha Rao, S., 1996. Lateral Capacity of Helical Piles in Clays. Journal of Geotechnical Engineering, ASCE, Vol. 122, No. 11, pp. 938-941.

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Seider, G., 1993. Eccentric Loading of Helical Piers for Underpinning. Proceedings of the 3rd International Conference on Case Histories in Geotechnical Engineering, Vol. 1, pp. 139-145.

Seider, G., Clemence, S.P., and Thurson, R.  Helical Piles with Grouted Shafts – Practical Overview,  Deep Foundations Institute Proceedings, October 2003, pp219-232.

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Zhang, Diane J.Y., 1999.  Predicting Capacity of Helical Screw Piles in Alberta Soils.  MSc Thesis, Geotechnical Engineering, Department of Civil and Environmental Engineering, University of Alberta

Zubeck, H. and Liu, H., 2002.  Design of Helical Piers in Frozen Silt.  Cold Regions Impacts on Transportation and Infrastructure 2002.

Design and Construction of Driven Pile Foundations, Volumes 1, 1998, FHWA Geotechnical Engineering Publication

Design of Pile Foundations, 1991, U.S.Army engineer manual

Static Testing of Deep Foundations, 2001, FHWA Geotechnical Engineering Publication An unusual estimation of bearing capacity of piles, 2001, Cambarieu, Bulletin des Laboratoires des Ponts et Chaussées 233

Evaluation of bearing capacity of piles from cone penetration test data, 1999, Louisiana Transportation Research Center

Friction fatigue on displacement piles in sand, 2004, White D.J. & Lehane B.M., Gotechnique 54(10):645-658

Barrettes : A Versatile Foundation for Transmission Line Towers, 2000, Thasnanipan N., Tanseng P., Maung A.W. & Anwar M. A., An International Conference on Geotechnical & Geological Engineering, Melbourne, Australia, 19-24 November 2000

A Half Century of Tapered-Pile Usage at the John F. Kennedy International Airport, 2004, John S. Horvath, Thomas Trochalides, Fifth International Conference on Case Histories in Geotechnical Engineering

Axial-Compressive Capacities of a New Type of Tapered Steel Pipe Pile at the John F. Kennedy International Airport, 2004, John S. Horvath, Thomas Trochalides, Andrew Burns, Stanley Merjan, Fifth International Conference on Case Histories in Geotechnical Engineering

A New Analytical Method for the Axial-Compressive Static Capacity of Tapered Driven Piles in Coarse-Grain Soil, 2003, John S. Horvath, IeC GEO3 - International e-Conference on Modern Trends in Geotechnical Engineering: Geotechnical Challenges and Solutions

Tapered Driven Piles: New Directions for an Old Concept, 2003, John S. Horvath, IeC GEO3 - International e-Conference on Modern Trends in Geotechnical Engineering: Geotechnical Challenges and Solutions

Continuous strain monitoring of large diameter steel piles, 1983, Carvalho, Osnyr, Kovari, Kalman, Proc. Field Measurements Geomechanics, Zurich

Continuum solution of lateral loading of large pile groups, 2004, A. Klar, A.D. Spasojevic and K. Soga, CUED/D-SOILS/TR 334, Cambridge University

The Limiting Pressure on a Circular Pile Loaded Laterally in Cohesive Soil, 1984, Randolph, M.F. and Houlsby, G.T., G?otechnique, Vol. 34, No. 4, December, pp 613-623, ISSN 0016-8505

The Influence of Spatial Variability on the Design of Pile Foundations, 1996, Jaksa, M. B., Brooker, P. I. and Kaggwa, W. S., Proceedings 7th Australia New Zealand Conf. on Geomechanics, Adelaide, pp. 526-531

Predictions of Pile Downdrag at Bothkennar, 1992, Rojas, E. and Houlsby, G.T., Proceedings of the Wroth Memorial

Symposium, Predictive Soil Mechanics, Oxford, July 27-29, ISBN 0-7277-1916-5, pp 813-814

ANALYSIS OF PILE SOIL INTERACTION , 2003, Yasser Khodair, Sophia Hassiotis, 16th ASCE Engineering Mechanics Conference, July 16-18 2003, University of Washington, Seattle

A constitutive model for overconsolidated clays with application to the cyclic loading of friction piles, 1987, Whittle, Andrew John, PhD thesis, Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering

Contribution to the study of tension piles under cyclic loading, 1983, Goulois, Alain Marcel, PhD thesis, Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering

Cyclic behavior of clay in undrained simple shearing and application to offshore tension piles, 1987, Malek, Aziz Moussa, PhD thesis, Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering

In situ measurements on a model pile in clay, 1984, Morrison, Michael Joseph, PhD thesis, Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering

Non-linear consolidation around driven piles in clays, 1982, Kavvadas, Michael, PhD thesis, Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering

Open-ended pile penetration in saturated clays, 1986, Chin, Chung-Tien, PhD thess, Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering

Behavior of grouted pile connections, 1980, Lee, Reginald Van, MS thesis, Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering

Underpinning strategies for buildings with deep foundations, 2004, Kordahi, Ray Z., MS thesis, Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering

Numerical Analysis of Pile Behavior under Lateral Loads in Layered Elastic-Plastic Soils, 2002, Int. J. Numer. Anal. Meth. Geomech., 2002, 26, pp 1385?1406, International Journal for Numerical and Analytical Methods in Geomechanics, Vol. 26, pp 1385-1406, December 2002.

Resistance Factors for Use in Load and Resistance Factor Design of Driven Pipe Piles in Sands, 2006, Foye, K.C., Abou Jaoude, G., Prezzi, M. and Salgado, R., Journal of Geotechnical and Geoenvironmental Engineering , ASCE, accepted for publication.

Determination of Bearing Capacity of Open-Ended Piles in Sand, 2004, Paik, K. and Salgado, R., Journal of Geotechnical and Geoenvironmental Engineering, 130(6), 658-660 (closure).

Grouting for Pile Foundation Improvement, 2001, Almer E.C. Van der Stoel, PhD thesis, Delft University Pile Foundation Improvement by Permeation Grouting, 2003, Almer E.C. van der Stoel, Grouting & Ground Treatment, Proc. of the 3rd intern. conference DFI / ASCE New Orleans