虞氏 Yúshì Yúshì 虞氏 (“Mr. Yú”), Táng-era commentator on the Nànjīng 難經; cited in 楊繼洲 Yáng Jìzhōu’s Zhēndào yuánliú essay in the Zhēnjiǔ dàchéng (KR3ee027). The commentary is lost; personal name otherwise unknown.