TKACHENKO O. Research of the emotional component of first-graders’ adaptation to school as an indicator of the effectiveness of the implementation of the principles of New Ukrainian School in the educational process. EHS:SS [Internet]. 2019 Sep. 27 [cited 2026 Jul. 22];19(3(I):52-63. Available from: https://ehs.eeipsy.org/index.php/ehs/article/view/108