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by Martynyuk, Anatoly A.; Leela, Srinivasa
by Martynyuk, Anatoly A.
by Lakshmikantham, Vangipuram; Leela, Srinivasa; Martynyuk, Anatoly A.
by Martynyuk, Anatoly; Chernetskaya, Larisa; Martynyuk, Vladislav
by Martynyuk; Anatoly
by Anatoly A. Martynyuk
by Vangipuram Lakshmikantham; Srinivasa Leela; Anatoly A. Martynyuk