@string{lncs="<A HREF=http://www.springer.de/comp/lncs/index.html>Lecture Notes in Computer Science</A>"}
@string{aug="August"}
@string{springer="© Springer-Verlag"}
@InProceedings{PV01,
  author = 	 {N. Piterman and M.Y. Vardi},
  title = 	 {From Bidirectionality to Alternation},
  booktitle = 	 {26th International Symposium on Mathematical Foundations of Computer Science},
  pages = 	 {598-610},
  year = 	 {2001},
  volume = 	 {2136},
  series = 	 lncs,
  address = 	 {Marianske Lazne, Czech Republic},
  month = 	 aug,
  publisher = springer,
  pdf = {2001/pv01.pdf},
  url        =   {2001/pv01.html},
  keywords = {Automata},
}