@article{DA_2010_17_5_a4,
     author = {E. V. Konstantinova and A. N. Medvedev},
     title = {Cycles of length seven in the pancake graph},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {46--55},
     publisher = {mathdoc},
     volume = {17},
     number = {5},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_2010_17_5_a4/}
}