Hajime Kitakami Tomoki Kanbara Yasuma Mori Susumu Kuroki Yukiko Yamazaki Modified PrefixSpan Method for Motif Discovery in Sequence Databases. 482-491 2002 conf/pricai/2002 PRICAI http://link.springer.de/link/service/series/0558/bibs/2417/24170482.htm db/conf/pricai/pricai2002.html#KitakamiKMKY02