Hernández-Castañeda, A. A., G. C. Aranzazu-Moya, G. M. Mora, and D. de P. Queluz. “Chemical Salivary Composition and Its Relationship With Periodontal Disease and Dental Calculus”. Brazilian Journal of Oral Sciences, vol. 14, no. 2, June 2015, pp. 159-65, doi:10.20396/bjos.v14i2.8640832.