.

Gorokhovsky , E. L., Volfson , G. L. and Petrov , A. P. (1970) "Development of the Oil Shale Industry in the USSR and Ways of Increasing Its Economic Efficiency", Journal of Mining Institute, 49(3), pp. 91-102. Available at: https://pmi.spmi.ru/pmi/article/view/12041 (Accessed: 5 December 2025).