Jacques Duparc, Kevin Fournier. A Tentative Approach for the Wadge-Wagner Hierarchy of Regular Tree Languages of Index [0, 2]. In Jeffrey Shallit, Alexander Okhotin, editors, Descriptional Complexity of Formal Systems - 17th International Workshop, DCFS 2015, Waterloo, ON, Canada, June 25-27, 2015. Proceedings. Volume 9118 of Lecture Notes in Computer Science, pages 81-92, Springer, 2015. [doi]
Abstract is missing.