Acta zoológica mexicana On-line version ISSN 2448-8445Print version ISSN 0065-1737
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ABRAHAMOVICH, Alberto H.; DIAZ, Norma B. and MORRONE, Juan J..Distributional patterns of the Neotropical and Andean species of the genus Bombus (Hymenoptera: Apidae). Acta Zool. Mex [online]. 2004, vol.20, n.1, pp.99-117.
ISSN 2448-8445.