@article{article6cc1e83b,
title   = {An unusual case of pneumoperitoneum: nephrocolic fistula due to a giant renal staghorn calculus},
author = {Alster, C. and Zantut, L. F. C. and Lorenzi, F. and Marchini, G. S. and Onofrio, B. J. M. and Nakahisma, A. A. and Gatto, B. E. O. and Birolini, D.},
year = {2007},
doi = {10.1259/bjr/65194982},
journal   = {The British Journal of Radiology}
}