@article{MM_2007_19_6_a1,
     author = {V. V. Sazonov},
     title = {Finding lighted surface parts of polygonal surface in parallel light flux},
     journal = {Matemati\v{c}eskoe modelirovanie},
     pages = {16--30},
     publisher = {mathdoc},
     volume = {19},
     number = {6},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MM_2007_19_6_a1/}
}