Matrosova VA, IVANOVA AD, Volodina EV, m.fl. Phylogenetic relationship and variation of alarm call traits of populations of red?cheeked ground squirrels (               Spermophilus erythrogenys               sensu lato) suggest taxonomic delineation.  2019. Available at: https://onlinelibrary.wiley.com/toc/17494877/14/4.