Michael Benedikt, Luc Segoufin. Regular tree languages definable in FO and in FO::::::mod::::::. ACM Trans. Comput. Log., 11(1), 2009. [doi]
@article{BenediktS09,
title = {Regular tree languages definable in FO and in FO::::::mod::::::},
author = {Michael Benedikt and Luc Segoufin},
year = {2009},
doi = {10.1145/1614431.1614435},
url = {http://doi.acm.org/10.1145/1614431.1614435},
researchr = {https://researchr.org/publication/BenediktS09},
cites = {0},
citedby = {0},
journal = {ACM Trans. Comput. Log.},
volume = {11},
number = {1},
}