@techreport{weko_145125_1,
   author	 = "Keisuke,Otaki and Akihiro,Yamamoto",
   title	 = "Periodic Pattern Mining with Periodical Co-occurrences of Symbols",
   year 	 = "2015",
   institution	 = "Kyoto University／Japan Society for the Promotion of Science, Kyoto University",
   number	 = "7",
   month	 = "sep"
}