4 Mb pseudo/virtually SRAM: S Yoshioka, Y Nagatoma, S Takahashi, S Miyamoto, M Uesugi (Oki Electr. Ind. Inc., Tokyo, Japan) 1987 IEEE International Solid State Circuits Conference. Digest of Technical Papers. ISSCC. First Edition, New York, USA, 25–27 Feb. 1987 (Coral Gables FL, USA: Lewis Winner, Feb. 1987), pp. 20–21, 320–322. In German