Ratajek-Gruda, Monika, et al. “Large Sialolith of the Duct of Submandibular Salivary Gland Removed With Electric Knife”. Journal of Education, Health and Sport, vol. 7, no. 6, June 2017, pp. 447-55, https://apcz.umk.pl/JEHS/article/view/4559.