SPECIES-ISOLATING MECHANISMS IN MALE BUMBLE BEES (HYMENOPTERA, APIDAE)SVENSSON BG.1981; DISS. ABSTR. INT. SECT. C: EUR. ABSTR.; ISSN 0307-6075; USA; DA. 1981-07; VOL. 42; NO 1; PP. 53; RESUME SEULEMENT;[; THESE/UPPSALA UNIV. (SWE)/1980]Thesis

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