@article{MET_1987__34_176124,
     author = {S.H. Ong},
     title = {Some {Notes} on the {Non-central} {Negative} {Binomial} {Distribution.}},
     journal = {Metrika},
     pages = {225--236},
     publisher = {mathdoc},
     volume = {34},
     year = {1987},
     zbl = {0621.60016},
     url = {http://geodesic.mathdoc.fr/item/MET_1987__34_176124/}
}