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"Paramagnetic resonance and magnetic energy levels in chrome alum",Bagguley D M S & Griffiths J H E. ,Nature 160:532-5, 1947.
"Paramagnetic resonance at low temperatures in chromic alum",Bleaney B & Penrose R P. ,Proc. Phys. Soc. London A 60:395, 1948.
Theory of the Nuclear Hyperfine Structure of Paramagnetic Resonance Spectra in CrystalsA. Abragam, M. H. L. Pryce,Published 22 January 1951. DOI: 10.1098/rspa.1951.0022
The Dipolar Broadening of Magnetic Resonance Lines in Crystals,J. H. Van Vleck,Phys. Rev. 74, 1168 – Published 1 November 1948
Exchange Narrowing in Paramagnetic ResonanceP.