@article{SEMR_2012_9_a21,
     author = {A. \`E. Frid},
     title = {Fine and {Wilf{\textquoteright}s} theorem for permutations},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {377--381},
     publisher = {mathdoc},
     volume = {9},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2012_9_a21/}
}