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Henning, J. C. M., & De Waard, C. (1962).
On the interpretation of the nitrogen-14 hyperfine interactions in electron spin resonance spectra of heterocyclic anions. Physics Letters, 3(3), 139–141.
doi:10.1016/0031-9163(62)90063-x
10.1016/0031-9163(62)90063-x
