Zimmermann, Herbert Zimmermann Group, Max Planck Institute for Medical Research, Max Planck Society;
http://onlinelibrary.wiley.com/doi/10.1002/jlac.19586120122/epdf (Any fulltext)
https://dx.doi.org/10.1002/jlac.19586120122 (Any fulltext)
Zimmermann, H. (1958). Röntgenographische Struckturuntersuchung der Assoziate des 4(5)-Methyl-Imidazols. Liebigs Annalen der Chemie, 612(1), 194-204. doi:10.1002/jlac.19586120122.