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Kuiper, J. G. J. (1987). Pisidium maasseni n. sp., a new species from Lake Prespa, Jugoslavia (Bivalvia, Sphaeriidae). Basteria. 51: 163-165.
Kuiper, J. G. J. (1987). Pisidium maasseni n. sp., a new species from Lake Prespa, Jugoslavia (Bivalvia, Sphaeriidae). Basteria. 51: 163-165.