@article{DAN_1989_304_3_a8,
     author = {I. N. Ponomarenko},
     title = {The isomorphism problem for classes of graphs},
     journal = {Doklady Akademii Nauk},
     pages = {552--556},
     publisher = {mathdoc},
     volume = {304},
     number = {3},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_304_3_a8/}
}