@article{DA_2011_18_2_a1,
     author = {O. V. Borodin and A. O. Ivanova},
     title = {2-distance 4-coloring of planar subcubic graphs},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {18--28},
     publisher = {mathdoc},
     volume = {18},
     number = {2},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_2011_18_2_a1/}
}