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MEZHDUNARODNAYA KNIGA.

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JOHN WILEY & SONS LTD.

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IOP PUBLISHING LTD.

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INDIAN NAT SCI ACAD.

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MEZHDUNARODNAYA KNIGA.

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KARL-MARX-UNIV.

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COUNCIL SCIENTIFIC INDUSTRIAL RESEARCH.

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HADRONIC PRESS INC.

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CZECHOSLOVAK MATHEMATICAL JOURNAL.

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WRITERS UNION USSR.

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MEZHDUNARODNAYA KNIGA.

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CAMBRIDGE UNIV PRESS.

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KLUWER ACADEMIC PUBL.

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PUBL HOUSE BULGARIAN ACAD SCI.

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