Ultrasmall: The smallest MIPS soft processor. - Hiroshi Nakatsuka; Yuichiro Tanaka; Thiem Van Chu; Shinya Takamaeda-Yamazaki; Kenji Kise (FPL, 2014)

Ultrasmall: A Tiny Soft Processor Architecture with Multi-Bit Serial Datapaths for FPGAs. - Shinya Takamaeda-Yamazaki; Hiroshi Nakatsuka; Yuichiro Tanaka; Kenji Kise (IEICE Trans. Inf. Syst., 2015)