@article{DM_2015_27_1_a2,
     author = {S. S. Davidov},
     title = {Free commutative medial $n$-ary groupoids},
     journal = {Diskretnaya Matematika},
     pages = {34--43},
     publisher = {mathdoc},
     volume = {27},
     number = {1},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_2015_27_1_a2/}
}