[1]M. N. Vahnina, "The Ecology of Russian Cities in the North. Vorkuta Industrial Region", PMI, т. 150, вып. 1, сс. 155-158, мар. 2002.

[1]M. N. Vahnina, "The Ecology of Russian Cities in the North. VORKUTA Industrial Region", PMI, vol. 150, no. 1, pp. 155-158, Mar. 2002.