Ioffe, A. D., & Tikhomirov, V. M. (1979). Theory of extremal problems. North-Holland Pub. Co. ; sole distributors for the U.S.A. and Canada, Elsevier North-Holland.

Ioffe, Aleksandr Davidovich, and Vladimir M. Tikhomirov. Theory of Extremal Problems. Amsterdam ; New York : New York: North-Holland Pub. Co. ; sole distributors for the U.S.A. and Canada, Elsevier North-Holland, 1979.

Ioffe, Aleksandr Davidovich, and Vladimir M. Tikhomirov. Theory of Extremal Problems. North-Holland Pub. Co. ; sole distributors for the U.S.A. and Canada, Elsevier North-Holland, 1979.