@string{lncs="<A HREF=http://www.springer.de/comp/lncs/index.html>Lecture Notes in Computer Science</A>"} @string{springer="© Springer-Verlag"} @InProceedings{KP09, author = {O. Kupferman and N. Piterman}, title = {Lower Bounds on Witnesses for Nonemptiness of Universal co-Buchi Automata}, booktitle = {12th International Conference on Foundations of Software Science and Computation Structures}, pages = {182-196}, year = {2009}, volume = {5504}, series = lncs, publisher = springer, pdf = {2009/KP09.pdf}, url = {2009/KP09.html}, keywords = {Automata}, }