Peeters, D., Zeegers-Huyskens, Th., & Migchels, P. (1991). Fourier transform infrared and theoretical study of alkylimines complexed with hydroxylic proton donors. Journal of Physical Chemistry, 95(20), 7599-7604. https://doi.org/10.1021/j100173a010 (Original work published 1991)