Semchenkova, S. A., Kruglikovskaya Т. F., S. S. Mulkibayeva, и N. M. Tussupova. «Status Indicators of the Mucosal Epithelial Cells of the Lips and Cheeks in Older People, Lived Big City and Village». Experimental Biology, т. 63, вып. 1, март 2016 г., сс. 145-9, https://bb.kaznu.kz/index.php/biology/article/view/1018.