db/conf/cikm/NakayamaYK97.html Ken Nakayama Kazunori Yamaguchi Satoru Kawai I-Regular Expression: Regular Expression with Continuous Interval Constraints. 40-50 CIKM1997/P040.pdf 1997 conf/cikm/97 CIKM http://doi.acm.org/10.1145/266714.266854 db/conf/cikm/cikm97.html#NakayamaYK97