A model for a document retrieval system. - Tadahiko Takahama (Inf. Storage Retr., 1973)

Panel: Directions in Database Research. - George A. Champine; Craig Fields; Koichi Furukawa; David Jefferson; Fritz Krückeberg; Giora Pelled; Charles Purcell; John Rundell; Tadahiko Takahama (VLDB, 1977)