Viehe, H. et al. 1976. Pyridines and Quinolines from 1,3-Dichloro-Trimethinecyanines Pyrimidine and Quinazoline from Azacyanine. CHIMIA. 30, 3 (Mar. 1976), 189. DOI:https://doi.org/10.2533/chimia.1976.189.