Kumar, Rakesh, Tarun Kumar Danda, and Atul Tandon. 2020. “A Randomized Comparative Study of 0.1% Levobupivacaine With Fentanyl Vs 0.1% Ropivacaine With Fentanyl in Patients of Labor Analgesia”. Academia Anesthesiologica International 5 (2), 205-8. http://aijournals.com/index.php/aan/article/view/1894.