Duda, K. M., and O. I. Lebid. “The Prevalence of Dental Diseases Among Children Aged 6 to 9 Years”. Clinical Dentistry0, no. 1 (May 23, 2019): 48-51. Accessed February 17, 2020. https://ojs.tdmu.edu.ua/index.php/kl-stomat/article/view/10147.