@article{gupta_yadav_2006,  title={Eggshell calcification of kidney in ureteropelvic junction obstruction},  volume={32},  ISSN={1677-5538},  url={https://doi.org/10.1590/S1677-55382006000500008},  DOI={10.1590/S1677-55382006000500008},  number={5},  journal={International braz j urol},  publisher={Sociedade Brasileira de Urologia},  author={Gupta, Narmada P. and Yadav, Rajiv},  year={2006},  month={Sep},  pages={557–559} }