1. ABAQUS 5.4 [Computer software]. Hibbit Karlsson & Sorensen Inc. Pawtucket RI.
2. Burns J. Q. and Richard R. M. (1964). “Attenuation of stresses for buried cylinders.” Proc. Symp. on Soil–Structure Interaction Univ. of Arizona Engineering Research Laboratory Tucson AZ 378–392.
3. CANDE [Computer software]. MGK Consulting Gig Harbor WA.