@Inproceedings{EPTCS256.16,
  author    = {Della Monica, Dario and Montanari, Angelo and Sala, Pietro},
  year      = {2017},
  title     = {Beyond $\omega$BS-regular Languages: $\omega$T-regular Expressions and Counter-Check Automata},
  editor    = {Bouyer, Patricia and Orlandini , Andrea  and San Pietro, Pierluigi},
  booktitle = {{\rm Proceedings Eighth International Symposium on}
               Games, Automata, Logics and Formal Verification,
               {\rm Roma, Italy, 20-22 September 2017}},
  series    = {Electronic Proceedings in Theoretical Computer Science},
  volume    = {256},
  publisher = {Open Publishing Association},
  pages     = {223-237},
  doi       = {10.4204/EPTCS.256.16},
}