@unpublished{ictcs17_omega_languages,
  title = "Counter-queue automata with an application to a meaningful
           extension of omega-regular languages",
  author = "Barozzini, D. and Della Monica, D. and A. Montanari and
            P. Sala",
  note = "18th Italian Conference on Theoretical
            Computer Science (ICTCS)",
  year = "2017"
}