Chernyavskikh, S. D., M. A. Velichko, I. B. Kostina, Y. P. Gladkikh, L. V. Krasovskaya, and O. N. Satler. “Improving Educational Process Quality in the Lessons of Natural and Mathematical Cycle by Means of Stem-Training”. Cypriot Journal of Educational Sciences, vol. 13, no. 4, Dec. 2018, pp. 501-10, doi:10.18844/cjes.v13i4.3857.