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scholarly article by Robert Mertens published 1 December 1952 in Abhandlungen der Senckenbergischen Naturforschenden Gesellschaft

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scientific article published in 1950

scientific article published on 26 December 1952

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article by Robert Mertens published 1955 in Bulletin of Zoological Nomenclature

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scientific article published on 30 December 1959

scientific article published on 31 August 1968

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scientific article published on 10 April 1937

scientific article published in 1966

scientific article published on 29 May 1953

scientific article published on 2 June 1952