Quantitative analysis of international mobility of robotics researchers and characteristics of domestic robotics research. - Takao Furukawa; Nobuyuki Shirakawa; Kumi Okuwada; Kazuya Sasaki (IEEM, 2011)

Quantitative analysis of collaborative and mobility networks. - Takao Furukawa; Nobuyuki Shirakawa; Kumi Okuwada (Scientometrics, 2011)

International mobility of researchers in robotics, computer vision and electron devices: A quantitative and comparative analysis. - Takao Furukawa; Nobuyuki Shirakawa; Kumi Okuwada; Kazuya Sasaki (Scientometrics, 2012)

Global competition and technological transition in electrical, electronic, information and communication engineering: quantitative analysis of periodicals and conference proceedings of the IEEE. - Nobuyuki Shirakawa; Takao Furukawa; Minoru Nomura; Kumi Okuwada (Scientometrics, 2012)