Besides these eleven commentators, there are several others whose work has not come down to us. The Sui Shu mentions four, namely 王凌 Wang Ling (often quoted by Tu Yu as 王子 ); 張子尚 Chang Tzǔ-shang ; 賈詡 Chia Hsü of 魏 Wei ; 114 and 沈友 Shên Yu