1. Rao BG. Behavior of skirted granular piles. Ph.D. thesis. Roorkee (India): Univ. of Roorkee; 1982.
2. Balla A. The resistance to breaking out of mushroom foundations for pylons. In: Proc 5th international conference on soil mechanics and foundation engineering, Paris, France; 1961. p. 569–76.
3. The ultimate uplift capacity of foundations;Meyerhof;Can Geotech J,1968
4. Anchor behavior in sand;Hanna;J Soil Mech Found Eng Div,1972
5. Model tests for uplift capacity of foundations in clay;Das;Soils Found,1978