@InProceedings{Woelfel2002a, 
  author = 	 {Philipp Woelfel},
  title = 	 {A Lower Bound Technique for Restricted Branching Programs and Applications},
  booktitle =    {Proceedings of the  18th Annual Symposium on Theoretical Aspects of Computer Science},
  year = 	 2002,
  pages =        {431-442},
  series =       {Lecture Notes in Computer Science},
  volume =       2285
}