"Yoshifumi Okuda,Yoshitoshi Tanaka","What are the critical factors making influences on the selection of patents to be maintained or abandoned, for proper patent portfolio?","IAITL 2014","Information Ethics and Security","IAITL",,,"pp. 285-300",2014,Oct.
"Yoshifumi Okuda,Yoshitoshi Tanaka","Study of blocking patents and many patents strategy by Japanese big companies",,"International Journal of Liability and Scientific Enquiry",,"Vol. 7",,"pp. 18-31",2014,Jan.