A Fully Static Topologically-Compressed 21-Transistor Flip-Flop With 75% Power Saving. - Natsumi Kawai; Shinichi Takayama; Junya Masumi; Naoto Kikuchi; Yasuo Itoh; Kyosuke Ogawa; Akimitsu Ugawa; Hiroaki Suzuki; Yasunori Tanaka (IEEE J. Solid State Circuits, 2014)