@article{MM_1994_6_5_a2,
     author = {V. V. Pilyugin and L. N. Sumarokov},
     title = {Geometric modeling},
     journal = {Matemati\v{c}eskoe modelirovanie},
     pages = {21--36},
     publisher = {mathdoc},
     volume = {6},
     number = {5},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MM_1994_6_5_a2/}
}