File:Holmquist, A.M. 1928. Studies in arthropod hibernation. II. The hibernation of the ant, Formica ulkei (10.1086@physzool.1.3.30151051).pdf

Summary
Holmquist, A.M. 1928. Studies in arthropod hibernation. II. The hibernation of the ant, Formica ulkei Emery. Physiological Zoology 1, 325-357.