Collect. Czech. Chem. Commun.
1972, 37, 2746-2763
https://doi.org/10.1135/cccc19722746
The tautomerism of quaternary salts of isoquinoline type. The effect of the position and nature of electron donating substituents on the spectroscopic and polarographic behaviour of these substances
V. Šimánek, V. Preininger, S. Hegerová and F. Šantavý