@techreport{weko_74444_1,
   author	 = "TranMinhQuang and Eiji,Kamioka",
   title	 = "Mobile Phone-Based Traffic State Estimation – The Penetration Rate Issue –",
   year 	 = "2011",
   institution	 = "Graduate school of Engineering, Shibaura Institute of Technology, Graduate school of Engineering, Shibaura Institute of Technology / National Institute of Informatics",
   number	 = "5",
   month	 = "may"
}