Nurmakhanov Баймахан, and Bektibaeva Z.K. Бектибаева З.К. “On One Method for Determining the Number and Plan of Natural Experiments”. Рroblems of engineering and professional education 12, no. 2 (March 6, 2023): 53–57. Accessed November 21, 2024. https://bulprengpe.enu.kz/index.php/main/article/view/618.