Vahnina , M. N. 2002. "The Ecology of Russian Cities in the North. Vorkuta Industrial Region". Записки Горного института 150 (1), 155-58. https://pmi.spmi.ru/pmi/article/view/9555.

Vahnina , M. N. 2002. "The Ecology of Russian Cities in the North. VORKUTA Industrial Region". Journal of Mining Institute 150 (1), 155-58. https://pmi.spmi.ru/pmi/article/view/9555.