Another presentation of Dr.Naganuma book is, by Mr.Kiyoshi Arai, BSI.
Mr.Arai is the latest, and Dr.Naganuma is the first Japanese member of BSI.
Mr.Arai attends the BSI weekend every year, recently. You might familar with his face.
When he was young, he correspndent with Dr.Naganuma.
One day, he bought a book at an antique bookshop, belonged to Dr.Naganuma collection. Mr.Arai was suprsied to find his own memo to Dr.Naganuma found in that book!