@article{ 40,
  author = "Gyssens, Marc and Van den Bussche, Jan and Van Gucht, Dirk",
  title = "Expressiveness of efficient semi-deterministic choice constructs",
  volume = "820",
  year = "1994",
  journal = "Automata, Languages and Programming - ICALP 1994 (S. Abiteboul, E. Shamir, editors), Lecture Notes in Computer Science",
  pages = "106--117",
  groups = {adrem,adrem-published}
}