Patiny, S. and Michez, D. 2007.

New insights on the distribution and floral choices of Systropha Illiger, 1806 in Africa (Hymenoptera, Apoidea), with description of a new species from Sudan

. Zootaxa. 1461, 1 (Apr. 2007), 59–68. DOI:https://doi.org/10.11646/zootaxa.1461.1.6.