Reference

B.G. Svensson, Andreas Werner Ebmer, Shôichi Francisco Sakagami (1977): Lasioglossum (Evylaeus) boreale, a new Halictinae (Hymenoptera: Apoidea) species found in northern Sweden and on Hokkaido, Japan with notes on its biology. – Ent.scand. – 8: 219 - 229.