@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/