Neugebauer, Franz A. Department of Organic Chemistry, Max Planck Institute for Medical Research, Max Planck Society;
http://onlinelibrary.wiley.com/doi/10.1002/mrc.1270020212/epdf (Any fulltext)
https://doi.org/10.1002/mrc.1270020212 (Any fulltext)
Neugebauer, F. A., & Russel, G. A. (1970). Radical anions derived from 1,1,2,2-bis(1,3-diketo-2,2-bindanylidene)ethane and 1,1,4,4-bis(1,3-diketo-2,2-bindanylidene)butene-2. Organic Magnetic Resonance, 2(2), 191-195. doi:10.1002/mrc.1270020212.