Kuhn, Richard Max Planck Institute for Medical Research, Max Planck Society;
Kainer, Helmuth Max Planck Institute for Medical Research, Max Planck Society;
http://onlinelibrary.wiley.com/doi/10.1002/jlac.19525780130/epdf (Any fulltext)
https://dx.doi.org/10.1002/jlac.19525780130 (Any fulltext)
Kuhn, R., & Kainer, H. (1952). Ringöffnung am Tetraphenyl-pyrrol. Liebigs Annalen der Chemie, 578(1), 226-231. doi:10.1002/jlac.19525780130.