1. Bearing capacity of foundations on sand;Baki;J. Soil Mech, and Found. Div.,1970
2. The resistance to breaking out of mushroom foundations for pylons;Balla;5th ICSMFE,1961
3. Vertical bearing capacity factors for circular and strip footings on Mohr-Coulomb soil;Bolton;Can. Geotech.,1993
4. Sur le terme de surface dans le calcul des fondations en milieu pulverulent;Caquot;Proc. 3rd ICSMFE,1953
5. Limit Analysis and Soil Plasticity;Chen,1975