@article{GDZPPN000366498, title = {Computability and Complexity of Ray Tracing.}, journal = {Discrete \& computational geometry}, volume = {11}, year = {1994}, pages = {265-288}, zbl = {0807.68096}, url = {http://dml.mathdoc.fr/item/GDZPPN000366498} }
Reif, J.H.; Tygar, J.D.; Yoshida, A. Computability and Complexity of Ray Tracing.. Discrete & computational geometry, Tome 11 (1994) pp. 265-288. http://gdmltest.u-ga.fr/item/GDZPPN000366498/