@InProceedings{BolligWoelfel2001a, 
  author =	 {Beate Bollig and Philipp Woelfel},
  title =	 {A Read-Once Branching Program Lower Bound of {$\Omega(2^{n/4})$}
                  for Integer Multiplication Using Universal Hashing},
  booktitle = 	 {Proceedings of the 33rd Annual ACM Symposium on Theory of Computing},
  year = 	 2001,
  publisher =    {ACM Press},
  pages =	 {419-424}
}