Likelihood of overseas access to international co-authorships. - Hiroyuki Tomizawa; Masashi Shirabe (Scientometrics, 2002)

Likelihood of inbound/outbound access to co-authorship. - Masashi Shirabe; Hiroyuki Tomizawa (Scientometrics, 2004)

Restructuring the Japanese national research system and its effect on performance. - Takayuki Hayashi; Hiroyuki Tomizawa (Scientometrics, 2006)

Accuracy evaluation of Scopus Author ID based on the largest funding database in Japan. - Hirotaka Kawashima; Hiroyuki Tomizawa (Scientometrics, 2015)