Micro MUMPS: An Interactive Database Language for Micro-Computers. - Tan Watanabe; Tsuneharu Ohsawa; Hisao Kuma; Wakunaga Tsukada (Softw. Pract. Exp., 1981)

A Simple Database Language for Personal Computers. - Tan Watanabe; Tsuneharu Ohsawa; Takaji Suzuki (Commun. ACM, 1983)