<ref name="Kuznetsov-Ugamsky_1930">{{cite journal |first1=N. N. |last1=Kuznetsov-Ugamsky |year=1930 |title=Contributions to the study of the agents of evolution of faunistic ensembles. [In Russian.] |url= |journal=Doklady Akademii Nauk SSSR |publisher= |volume=1930 |issue= |pages=367–372 |doi= }}</ref>