Chernyavskikh SD, Velichko MA, Kostina IB, Gladkikh YP, Krasovskaya LV, Satler ON. Improving educational process quality in the lessons of natural and mathematical cycle by means of stem-training. CJES [Internet]. 2018 Dec. 26 [cited 2024 Nov. 6];13(4):501-10. Available from: https://un-pub.eu/ojs/index.php/cjes/article/view/3857