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2. Badie A. (1983). “Stability of spread footing supported by clay soil with an underground void ” thesis presented to the Pennsylvania State University at University Park Pa. in partial fulfillment of the requirements of the degree of Doctor of Philosophy.
3. Stability of Spread Footing Above Void in Clay
4. Baus R. L. (1980). “The stability of shallow continuous footings located above voids ” thesis presented to Pennsylvania State University at University Park Pa. in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
5. Bearing Capacity of Strip Footing above Void