Kovalchuk, I. Y., Zh. B. Zhumagulova, G. A. Madiyeva, Turdiev Т. Т., и S. N. Frolov. 2015. «Optimization of Conditions for Cryopreservation of Isolated Pear Meristems in Liquid Nitrogen». Вестник КазНУ. Серия биологическая 60 (2):261-64. https://bb.kaznu.kz/index.php/biology/article/view/949.