RAMISETTI, D. A.; BABU, D. R.; KOTHA, D. K. Influence of Salivary pH and Urea Level on Calculus Formation - A Clinical Study. Caribbean Journal of Sciences and Technology , [S. l.], v. 2, n. 01, p. 503–508, 2014. Disponível em: https://caribjscitech.com/index.php/cjst/article/view/85. Acesso em: 5 feb. 2025.