@misc{DM_1997_9_1_a13,
     title = {Fourth {International} {Petrozavodsk} {Conference}},
     journal = {Diskretnaya Matematika},
     pages = {155--156},
     publisher = {mathdoc},
     volume = {9},
     number = {1},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1997_9_1_a13/}
}