., I. Nikolaev, L. G. Gerasimova, A. I. Kalugin ., B. V. Levin ., and G. O. Kalashnikova . 2020. “Mineral Concentrates As a Factor of the Khibiny Apatite-Nepheline Ores Efficiency Improvement”. KnE Materials Science 6 (1), 221–226. https://doi.org/10.18502/kms.v6i1.8071.