David Janin. On labeled birooted tree languages: Algebras, automata and logic. Inf. Comput., 243:222-248, 2015. [doi]
@article{Janin15, title = {On labeled birooted tree languages: Algebras, automata and logic}, author = {David Janin}, year = {2015}, doi = {10.1016/j.ic.2014.12.016}, url = {http://dx.doi.org/10.1016/j.ic.2014.12.016}, researchr = {https://researchr.org/publication/Janin15}, cites = {0}, citedby = {0}, journal = {Inf. Comput.}, volume = {243}, pages = {222-248}, }