Xiaojian Zhang Huili Peng Chao Shao Mining Top-K Closed Frequent Traversal Sequences from Session Streams. 340-344 2008 FSKD (5) http://dx.doi.org/10.1109/FSKD.2008.83 conf/fskd/2008-5 db/conf/fskd/fskd2008-5.html#ZhangPS08