. . . . . . . "1957"^^ . . "Contributions to the theory of games Volume III, / C. Berge, L.D. Berkovitz, L.E.Dubins,... [et al.] ; Edited by M. Dresher, A.W. Tucker, P. Wolfe / Princeton, N. J. : Princeton University Press , 1957" . . . "21"^^ .