Combinatorics of Riordan arrays with identical A and Z sequences

@article{Cheon2012CombinatoricsOR,
  title={Combinatorics of Riordan arrays with identical A and Z sequences},
  author={Gi-Sang Cheon and Hana Kim and Louis W. Shapiro},
  journal={Discrete Mathematics},
  year={2012},
  volume={312},
  pages={2040-2049}
}