@article{PDMA_2012_5_a59,
     author = {L. N. Andreeva and V. A. Poteryaeva},
     title = {Involutions numeration},
     journal = {Prikladnaya Diskretnaya Matematika. Supplement},
     pages = {112--113},
     publisher = {mathdoc},
     number = {5},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDMA_2012_5_a59/}
}