Pure Appl. Chem., 1993, Vol. 65, No. 1, pp. 127-134
http://dx.doi.org/10.1351/pac199365010127
Conjugation-extended ring assemblies with central heterocycles. New multistage redox systems
First page:

Pure Appl. Chem., 1993, Vol. 65, No. 1, pp. 127-134
http://dx.doi.org/10.1351/pac199365010127