Vera V. Levites, Anna V. Beloshistaya, Nataliya V. Ivanch, Oleg I. Lyash,. 1. «Model-Based Educational Technique to Develop Mathematical Concepts in Preschoolers». Opción 35 (1), 2330-62. https://produccioncientificaluz.org/index.php/opcion/article/view/27473.