Kainer, Helmuth Max Planck Institute for Medical Research, Max Planck Society;
http://www.nature.com/nature/journal/v174/n4435/pdf/174830a0.pdf (Any fulltext)
https://dx.doi.org/10.1038/174830a0 (Any fulltext)
Bijl, D., Kainer, H., & Rose-Innes, A. C. (1954). Stabilization of free radicals by adsorption: detection by paramagnetic resonance. Nature, 174(4435), 830-831. doi:10.1038/174830a0.