Buchner, W. Max Planck Institute for Medical Research, Max Planck Society;
Emmerich, B. Max Planck Institute for Medical Research, Max Planck Society;
http://www.sciencedirect.com/science/article/pii/002223647190028X/pdf?md5=bddf8bd9ecd1e2e174ecfa74cb5a07a7&pid=1-s2.0-002223647190028X-main.pdf (Any fulltext)
https://doi.org/10.1016/0022-2364(71)90028-X (Any fulltext)
Buchner, W., & Emmerich, B. (1971). A new type of multiplet effect in dynamic nuclear polarization of 13C-nuclei. Journal of Magnetic Resonance, 4(1), 90-98. doi:10.1016/0022-2364(71)90028-X.