@article{ZNSL_2011_391_a8,
     author = {S. A. Obraztsova and A. V. Pastor},
     title = {About vertices of degree~$k$ of minimally and contraction critically $k$-connected graphs: upper bounds},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {198--210},
     publisher = {mathdoc},
     volume = {391},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2011_391_a8/}
}