Tomonobu Ozaki Takenao Ohkawa Discovery of Correlated Sequential Subgraphs from a Sequence of Graphs. 265-276 2009 ADMA http://dx.doi.org/10.1007/978-3-642-03348-3_27 conf/adma/2009 db/conf/adma/adma2009.html#OzakiO09