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Rajeev Kumar; Ajay Anand; Vaibhav Saxena; Amlesh Seth; Prem Nath Dogra; Narmada P. Gupta. (2011). Safety and efficacy of PCNL for management of staghorn calculi in pediatric patients. , 7(3), 0–251. doi:10.1016/j.jpurol.2011.02.016 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research