Chernyavskikh, S. D., Velichko, M. A., Kostina, I. B., Gladkikh, Y. P., Krasovskaya, L. V. and Satler, O. N. (2018) “Improving educational process quality in the lessons of natural and mathematical cycle by means of stem-training”, Cypriot Journal of Educational Sciences, 13(4), pp. 501–510. doi: 10.18844/cjes.v13i4.3857.