@article{MET_1986__33_176027,
     author = {P.A. Lee and S.H. Ong},
     title = {Bivariate {Non-central} {Negative} {Binomial} {Distributions:} {Another}  {Generalisation.}},
     journal = {Metrika},
     pages = {29--46},
     publisher = {mathdoc},
     volume = {33},
     year = {1986},
     zbl = {0601.62068},
     url = {http://geodesic.mathdoc.fr/item/MET_1986__33_176027/}
}