K. KHAJURIA, S. GUPTA, D. KUMAR, D. R. DOGRA, and V. KHAJURIA, “COMPARISON OF PREGABALIN AND NORTRIPTYLINE ON SLEEP, QUALITY OF LIFE IN POSTHERPETIC NEURALGIA: A PROSPECTIVE, RANDOMISED, OPEN-LABEL, PARALLEL STUDY”, Int J Pharm Pharm Sci, vol. 13, no. 6, pp. 27–30, Jun. 2021.