Bauer, Helmut Department of Organic Chemistry, Max Planck Institute for Medical Research, Max Planck Society;
http://onlinelibrary.wiley.com/doi/10.1002/cber.19671000542/epdf (Any fulltext)
https://doi.org/10.1002/cber.19671000542 (Any fulltext)
Bauer, H. (1967). Indigoide Farbstoffe aus β-Äthoxy-pyrrol-Derivaten. Chemische Berichte, 100(5), 1704-1709. doi:10.1002/cber.19671000542.