ICAPS 2014 talk on the paper
Stefan Edelkamp, Peter Kissmann, Martha Rohte.
Symbolic and Explicit Search Hybrid through Perfect Hash Functions — A Case Study in Connect Four.
Proceedings of the Twenty-Fourth International Conference on Automated
Planning and Scheduling. pp. 101-110. 2014. AAAI Press
(online available at
http://www.aaai.org/ocs/index.php/ICAPS/ICAPS14/paper/view/7921)