[1]
Pekkarinen, A. and Huldén, L. 1991. Distribution and phenology of the <i>Ancistrocerus</i> and <i>Symmorphus</i> species in eastern Fennoscandia (Hymenoptera, Eumenidae)¹. Entomologica Fennica. 2, 3 (Sep. 1991), 179–189. DOI:https://doi.org/10.33338/ef.83547.