Collect. Czech. Chem. Commun.
1968, 33, 994-998
https://doi.org/10.1135/cccc19680994
Correlations of proton chemical shifts of hydroxyl and methine groups in the NMR spectra of hydroxy derivatives of Schiff bases with Hammett σ constants
V. Bekárek, J. Klicnar, F. Kristek and M. Večeřa