1. Ahmad S, Gazetas G. Torsional impedances of embedded foundations, Research Report, Department of Civil Engineering, SUNY at Buffalo; 1991.
2. Torsional Stiffness of Arbitrarily-Shaped Embedded Foundations;Ahmad;J Geotech Eng, ASCE,1992
3. Torsional damping of arbitrarily-shaped embedded foundations;Ahmad,1992
4. Forced vibrations of a body on an infinite elastic solid;Arnold;J. Appl. Mech.,1955
5. Dynamics of bases and foundations;Barkan,1962