Dr. Jishnu.V,Dr Vinod Kumar Yadav,Dr Leena Goel,Dr Anshul Gaur 2026. A comparative study of local anaesthetic agent levobupivacaine and ropivacaine in ultrasound guided erector spinae plane block in patients undergoing laparoscopic cholecystectomy. International Journal of Pharmacy Research & Technology (IJPRT). 16, 2 (Jul. 2026), 351–364.