Hope, Andrew G., Waltari, Eric, Dokuchaev, Nikolai E., Abramov, Sergey, Dupal, Tamara, Tsvetkova, Albina, Henttonen, Heikki, Macdonald, S. O., and Cook, Joseph A., 2010, High-latitude diversification within Eurasian least shrews and Alaska tiny shrews (Soricidae): Journal of mammalogy, v. 91, no. 5, p. 1041-1057.