“A 20-ns 256KX4 FIFO Memory”　by M Hashimoto, N Kitagawa et’al
P490-499, IEEE Journal of solid State Circuits Vol23, No2, April 1988

“A Monolithic Voice Recorder” by T Takamizawa, N Kitagawa et’al
ISSCC digest FAM19.1, P264-265, 1982

“Sense Amplifier Design is the key to 1-transistor cell in 4096-bit RAM”　
by C Kuo, N Kitagawa etal Electronics, Sept 13, 1973