Baoyao Zhou Siu Cheung Hui Alvis Cheuk M. Fong An Efficient Approach for Mining Periodic Sequential Access Patterns. 485-494 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3157&spage=485 2004 conf/pricai/2004 PRICAI db/conf/pricai/pricai2004.html#ZhouHF04