Alon Regev. A Proof of Catalan's Convolution Formula. Integers, 12, 2012. [doi]
@article{Regev12-0, title = {A Proof of Catalan's Convolution Formula}, author = {Alon Regev}, year = {2012}, url = {http://math.colgate.edu/~integers/m29/m29.Abstract.html}, researchr = {https://researchr.org/publication/Regev12-0}, cites = {0}, citedby = {0}, journal = {Integers}, volume = {12}, }