@article{AM2_1982__25_136947,
     author = {H.-H. Kairies and M.E. Muldoon},
     title = {Some characterizations of q-factorial functions.},
     journal = {Aequationes mathematicae},
     pages = {67--76},
     publisher = {mathdoc},
     volume = {25},
     year = {1982},
     zbl = {0524.33001},
     url = {http://geodesic.mathdoc.fr/item/AM2_1982__25_136947/}
}