Wieland, Theodor Max Planck Institute for Medical Research, Max Planck Society;
https://www.sciencedirect.com/science/article/pii/004040207780447X/pdf?md5=45bc4ad815de625a9a6634b98cdf58c3&pid=1-s2.0-004040207780447X-main.pdf (Any fulltext)
https://doi.org/10.1016/0040-4020(77)80447-X (Any fulltext)
Siemion, I., & Wieland, T. (1977). The amide-aromatic-ring system: An inherently dissymmetric chromophore. Tetrahedron: Asymmetry, 33(1), 155-157. doi:10.1016/0040-4020(77)80447-X.