1. M.L. Williams, Journal of Applied Mechanics, 19 (1952) 526?530; 24 (1957).
2. J.P. Benthem, Euromech. Conference No. 39, Ronneby, Sweden (June, 1972) or Report no. 563, Department of Mech. Eng., Delft University of Technology, The Netherlands, September 1975.
3. A.I. Lur'e, Three-Dimensional Problems of the Theory of Elasticity, Interscience Publishers, New York (1964).
4. E.S. Folias, Journal of Applied Mechanics, 42, No. 3 (1975) 663?674.
5. J.P. Benthem and W.T. Koiter. Journal of Applied Mechanics, 43, No. 2 (1976) 374.