Theoretical Calculations of the Substituent Effects on the Tautomeric Equilibrium of 6-X-2(1H)-pyridones
Zou Jian-Wei, Yu Qing-Sen, Zhu Long-Guan
Acta Phys. -Chim. Sin. . 1998, (11): 1040 -1042 .  DOI: 10.3866/PKU.WHXB19981115