@article{TIMB_2012_20_1_a7,
     author = {R. A. Petrovich},
     title = {Relaxation of the famous $NP$-complete polar graphs recognition problem leading to the fast polynomial-time algorithm},
     journal = {Trudy Instituta matematiki},
     pages = {74--82},
     year = {2012},
     volume = {20},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMB_2012_20_1_a7/}
}