@article{SJVM_2008_11_3_a2,
     author = {V. A. Amelkin},
     title = {Enumeration problems of oriented serial sequences},
     journal = {Sibirskij \v{z}urnal vy\v{c}islitelʹnoj matematiki},
     pages = {271--282},
     publisher = {mathdoc},
     volume = {11},
     number = {3},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SJVM_2008_11_3_a2/}
}