L. Lollen, N. Sengul, D. M., L. P. Singh, T. Annu, and K. M. Marak, “Comparison of thoracic epidural analgesia and ultrasound guided erector spinae plane block for post operative pain control following laparoscopic cholecystectomy: a randomized clinical trial”, Int J Res Med Sci, vol. 13, no. 11, pp. 4815–4822, Oct. 2025.