Seifert B. Formica nigricans Emery, 1909 - an ecomorph of Formica pratensis Retzius, 1783 (Hymenoptera, Formicidae). Entomol. Fennica [Internet]. 1991 Dec. 1 [cited 2026 Apr. 3];2(4):217-26. Available from: https://journal.fi/entomolfennica/article/view/83554