Altinayar, S., F. Ozer, Y. Turkoz, H. Isin Ozisik, S. Cetin, E. Altinoz, and C. Ozcan. “Effect Of L-Deprenyl On Nitric Oxide Metabolites In Parkinson’s Disease Patients”. Annals of Medical Research, vol. 12, no. 3, May 2021, pp. 0185-8, http://www.annalsmedres.org/index.php/aomr/article/view/3114.