In addition, students of acupuncture had to study Kotei Somonkyo (Basic Questions in Yellow Emperor's Inner Canon, covering the theoretical foundation of Chinese medicine and its diagnostic methods), Kotei Shinkyo (Needling Canon in Yellow Emperor's Inner Canon, discussing the acupuncture therapy in detail), Myakuketsu (a Chinese classic on sphygmoscopy), and Kotei Myodokyo (a Chinese classic on acupuncture, highly valued along with Kotei Shinkyo).