Srivastava, Rohan, and N. D. Kantharia. “Evaluation of Effect of Amitriptyline and Pregabalin on Heart Rate Variability in Neuropathic Pain in Non-Diabetic Patients”. International Journal of Research in Medical Sciences 10, no. 5 (April 26, 2022): 1145–1150. Accessed October 14, 2025. https://www.msjonline.org/index.php/ijrms/article/view/10701.