Kudrina, K., I. Chechina, L. Sarap, A. Zejbert, and A. Lytkina. “Study of Self-Assessment of Oral Health in Children Living in the Altai Region”. Clinical Dentistry (Russia), vol. 24, no. 3, Sept. 2021, p. 25—31, http://www.kstom.ru/ks/article/view/0099-04.