@techreport{weko_62666_1,
   author	 = "Yu,QIAO and Masayuki,SUZUKI and Nobuaki,MINEMATSU",
   title	 = "An Investigation of Hidden Structure Model",
   year 	 = "2009",
   institution	 = "Graduate School of Information Science and Technology, The University of Tokyo, Graduate School of Engineering, The University of Tokyo, Graduate School of Information Science and Technology, The University of Tokyo",
   number	 = "5",
   month	 = "jul"
}