Levin, M. I., I. V. Pentegov, S. V. Rymar, and A. V. Lavreniuk. “Analysis of Three-Phase Power Transformer Laminated Magnetic Core Designs”. Electrical Engineering & Electromechanics, no. 1, Mar. 2014, pp. 40-44, doi:10.20998/2074-272X.2014.1.08.