Pekkarinen, Antti, Øistein Berg, Isabel Calabuig, Lars-Åke Janzon, and Jaan Luig. 2003. “Distribution and Co-Existence of the <i>Macropis</i> Species and Their Cleptoparasite <i>Epeoloides coecutiens</I> (Fabr.) in NW Europe (Hymenoptera: Apoidea, Melittidae and Apidae)”. Entomologica Fennica 14 (1):53–59. https://doi.org/10.33338/ef.84171.