Li Guo, William Y. Sit. Enumeration and Generating Functions of Rota-Baxter Words. Mathematics in Computer Science, 4(2-3):313-337, 2010. [doi]
@article{GuoS10-5, title = {Enumeration and Generating Functions of Rota-Baxter Words}, author = {Li Guo and William Y. Sit}, year = {2010}, doi = {10.1007/s11786-010-0061-2}, url = {http://dx.doi.org/10.1007/s11786-010-0061-2}, researchr = {https://researchr.org/publication/GuoS10-5}, cites = {0}, citedby = {0}, journal = {Mathematics in Computer Science}, volume = {4}, number = {2-3}, pages = {313-337}, }