Akihiro Hayakawa (Tohoku University) has co-authored with 138 scholars at 22 institutions, between 1988 and 2026. 44 of them within the last 4 years. Strongest collaborators, by shared papers: Hideaki Kobayashi, Takahiro Kudo, Ekenechukwu C. Okafor, Toshiaki KITAGAWA, K.D. Kunkuma A. Somarathne and Yukihide NAGANO.