By Portenko M.   in Ukrainian Mathematical Journal

ISSN:0041-5995|57|9|1522-1534

Springer Publishing Company ‎(2005)‎

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By Kovalenko I.M.   Korolyuk V.S.   Portenko M.I.   Samoilenko A.M.   Syta G.M.   Yadrenko M.I.   in Ukrainian Mathematical Journal

ISSN:0041-5995|52|9|1321-1323

Springer Publishing Company ‎(2000)‎

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By Mitropol'skii Y.A.   Samoilenko A.M.   Skorokhod A.V.   Korolyuk V.S.   Perestyuk M.O.   Portenko M.I.   Kozachenko Y.V.   Buldygin V.V.   Ponomarenko A.I.   in Ukrainian Mathematical Journal

ISSN:0041-5995|54|4|533-535

Springer Publishing Company ‎(2002)‎

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