.

Sochnev , A. Ya. 1934. “Magnetic Field of Electromagnetic Separators M. V. N. 6 (with Ring Magnets) and M. D. 4 (with Reversible Magnetic Poles) and the Theory of Calculation of Electromagnetic Systems of Separators of These Types”. Journal of Mining Institute 8 (January), 190-207. https://pmi.spmi.ru/pmi/article/view/15264.