Christian Krattenthaler, Sri Gopal Mohanty. q-generalization of a ballot problem. Discrete Mathematics, 126(1-3):195-208, 1994. [doi]
@article{KrattenthalerM94,
title = {q-generalization of a ballot problem},
author = {Christian Krattenthaler and Sri Gopal Mohanty},
year = {1994},
doi = {10.1016/0012-365X(94)90264-X},
url = {http://dx.doi.org/10.1016/0012-365X(94)90264-X},
researchr = {https://researchr.org/publication/KrattenthalerM94},
cites = {0},
citedby = {0},
journal = {Discrete Mathematics},
volume = {126},
number = {1-3},
pages = {195-208},
}