Birkofer, Leonhard Max Planck Institute for Medical Research, Max Planck Society;
http://onlinelibrary.wiley.com/doi/10.1002/cber.19520851108/epdf (Any fulltext)
https://dx.doi.org/10.1002/cber.19520851108 (Any fulltext)
Birkofer, L. (1952). Konstitution von Dihydrophenazin-Derivaten. Chemische Berichte, 85(11), 1023-1034. doi:10.1002/cber.19520851108.