Nishitha Arun and Sindhu Ramesh, “Estimation Of Substance P Level In Normal Pulpal Condition Compared To Pulpal And Periapical Diseases”, J Popl Ther Clin Pharmacol, vol. 30, no. 10, pp. 406–412, May 2023, doi: 10.47750/jptcp.2023.30.10.045.