@article{CTT100779856,
  author = {Yoshinori Tsurusaki and Yoshitoshi Tanaka},
  title = {Defining the technical roadmap in filtering technology for hydraulic excavators using customers' patent information},
  journal = {International Journal of Liability and Scientific Enquiry},
  year = 2014,
}

@article{CTT100787086,
  author = {Yoshinori Tsurusaki and Yoshitoshi Tanaka},
  title = {Defining the technical roadmap in filtering technology for hydraulic excavators using customers' patent information},
  journal = {International Association of IT Lawyers (IAITL)},
  year = 2013,
}