Skornyakova, V. A.; Timasheva, I. Ye. (1980), "The possible environmental impact of the anti-Irtysh and problems of rational nature management", Soviet Geography, pp. 638–644, எண்ணிம ஆவணச் சுட்டி:10.1080/00385417.1980.10640361{{citation}}: Missing or empty |url= (help)
