Bagewadi SB, Hirpara DR, Paliwal A, Raiyani BD, Hafiz A, Vasra HD, Pampaniya HM.
Estimation of Salivary Copper, Zinc, Iron, and Copper-to-zinc Ratio in Oral Submucous Fibrosis Patients: A Case–control Study. 
J Contemp Dent Pract
2022;
23
(3):303-306.