Valavi, Ehsan, Azar Nickavar, and Pouria Sharififard. “An Egg Shape Bladder Stone in a Young Child”. Acta Medica Iranica 58, no. 2 (June 29, 2020): 94-96. Accessed July 10, 2020. https://acta.tums.ac.ir/index.php/acta/article/view/8067.