Veera Boonjing Panida Songram Efficient Algorithms for Mining Closed Multidimensional Sequential Patterns. 749-753 2007 FSKD (2) http://dx.doi.org/10.1109/FSKD.2007.265 conf/fskd/2007-2 db/conf/fskd/fskd2007-2.html#BoonjingS07