Tatsuya Asai Hiroki Arimura Kenji Abe Shinji Kawasoe Setsuo Arikawa Online Algorithms for Mining Semi-structured Data Stream. 27-34 2002 conf/icdm/2002 ICDM http://computer.org/proceedings/icdm/1754/17540027abs.htm db/conf/icdm/icdm2002.html#AsaiAAKA02