Pekkarinen, A. “Parasitism of <i>Stylops</i> (Strepsiptera, Stylopidae) in Poly- and Oligolectic <i>Andrena</i> Hosts (Hymenoptera, Apoidea)”. Entomologica Fennica, vol. 8, no. 2, June 1997, pp. 109-11, doi:10.33338/ef.83926.