@article{AM2_1978__18_136767,
     author = {Martin E. Muldoon},
     title = {Some monotonicity properties and characterizations of the gamma function.},
     journal = {Aequationes mathematicae},
     pages = {54--63},
     publisher = {mathdoc},
     volume = {18},
     year = {1978},
     zbl = {0386.33001},
     url = {http://geodesic.mathdoc.fr/item/AM2_1978__18_136767/}
}