Biswas, Manoj, Ankur Mittal, Rajeev Sarpal, Shikhar Agrawal, Ravinder Pal, and Karamaveer Singh. 2016. “Whether Retrograde Pyelography Mandatory for Percutaneous Nephrolithotomy: A Randomized Clinical Trial”. International Journal of Research in Medical Sciences 4 (10):4477-80. https://doi.org/10.18203/2320-6012.ijrms20163314.