Theory of shells : proceedings of the third IUTAM Symposium on Shell Theory, dedicated to the memory of academician I.N. Vekua, Tbilisi, U.S.S.R., August 22-28, 1978 / ed. by Warner Tjardus Koiter, G.K. MikhailovNew methods for solving elliptic equations / I.N. Vekua ; transl. from the Russian by D.E. Brown ; transl. ed. by A.B. Tayler