V. T. Thamarai Selvi, Dr. Sankari Malaiappan. “Comparison of Salivary PH and Clinical Periodontal Status in Smokers With and Without Periodontitis”. Journal of Coastal Life Medicine, vol. 10, Oct. 2022, pp. 648–656, https://www.jclmm.com/index.php/journal/article/view/116.