J. Williams, A. Raux, D. Ramachandran, and A. Black, “The dialog state tracking challenge,” Proc. SIGDIAL 2013 Conference, pp. 404-413, 2013.
D.A. Dahl, M. Bates, M. Brown, W. Fisher, K. Hunicke-Smith, D. Pallett, C. Pao, A. Rudnicky, and E. Shriberg, “Expanding the scope of the atis task : The atis-3 corpus,” Proc. workshop on Human Language Technology, pp. 43-48 1994.