@article{AM2_1978__17_136751,
     author = {Ronald J. Evans},
     title = {Bender's generalized q-binominal {Vandermonde} convolution.},
     journal = {Aequationes mathematicae},
     pages = {331--335},
     publisher = {mathdoc},
     volume = {17},
     year = {1978},
     zbl = {0382.05007},
     url = {http://geodesic.mathdoc.fr/item/AM2_1978__17_136751/}
}