[1]О. Н. Русак и Ю. Н. Николаев, "of the", PMI, т. 58, вып. 1, сс. 169-173, май 1969.

[1]O. N. Rusak and Y. N. Nikolaev, "To On the Question of Underground Thermal Insulation of Horizons Insulation at the Mines of the Apatit Combine", PMI, vol. 58, no. 1, pp. 169-173, May 1969.