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Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 16, No. 3, pp. 392–395, May–June, 1980.
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Odintsov, B.M., Barlev, A.A. & Il'yasov, A.V. Determination of the relative signs of the hyperfine coupling constants for the phosphonenitroxyl radical from the ESR spectra in weak fields. Theor Exp Chem 16, 305–307 (1981). https://doi.org/10.1007/BF00517289
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DOI: https://doi.org/10.1007/BF00517289