@article{DA_2009_16_3_a1,
     author = {D. Zh. Zambalayeva},
     title = {Partition of a~planar graph with girth~7 into two star forests},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {20--46},
     publisher = {mathdoc},
     volume = {16},
     number = {3},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_2009_16_3_a1/}
}