@article{DA_1999_6_4_a1,
     author = {O. V. Borodin and A. V. Kostochka and A. Raspaud and E. Sopena},
     title = {Acyclic coloring of 1-planar graphs},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {20--35},
     publisher = {mathdoc},
     volume = {6},
     number = {4},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_1999_6_4_a1/}
}