INVESTIGATION OF HYDRAZONE-AZO TAUTOMERISM OF PYRIDONE AZO DYESTUFFS I The Application of Nuclear Magnetic Resonance For Identification of the Configurations
Peng Qingji, Zhang Mingjia, Li Mujie, Gao Kunyu, Cheng Lubai
Chinese Journal of Magnetic Resonance . 1989, (2): 169 -176 .