1. Foundation repair using helical screw anchors;Carville,1995
2. Hubbell Power Systems, Inc. Civil Construction Helical Systems–Design Manual. Centralia, Missouri, USA, 2003
3. Bobbitt DW, Clemence SP. Helical anchors: Application and design criteria. In: Proceedings of the 9th Southeast Asian geotechnical conference. 1987. 2. p. 6/105–6/120
4. The behaviour of model screw piles in cohesive soils;Rao;Soils Found,1991
5. Monotonic and cyclic load behaviour of helical pile connectors in the vertical direction;Youssef;Canad J Civil Eng,2006