@article{article914370c4,
title   = {On the carbon-13 nuclear magnetic ressonance spectra of dimethyl fumarate and its thioderivatives: empirical shielding constants for the methyl ester and thioester substituents},
author = {Camilo, F F and Campos, I P A and Gruber, Jonas},
year = {1998},
journal   = {Journal of Chemical Research}
}