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Title: Authors: N. Bloembergen, E.M. Purcell, R.V. PoundJournal: Phys. Rev.73, 679-712Year: 1948Reference: N. Bloembergen, E.M. Purcell, R.V. Pound. Relaxation effects in nuclear magnetic absorption, Phys. Rev. 73, 679-712 (1948).

Title: Authors: J.H. FreedJournal: J. Phys. Chem.71, 38-51Year: 1967Reference: J.H. Freed. Theory of saturation and double resonance effects in electron spin resonance spectra 2. Exchange vs dipolar mechanisms, J. Phys. Chem. 71, 38-51 (1967).

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Title: Authors: M.P. Eastman, R.G. Kooser, M.P. Das and J.H. FreedJournal: J. Chem. Phys.51, 2690-2709Year: 1969Reference: M.P. Eastman, R.G. Kooser, M.P. Das and J.H. Freed. Studies of Heisenberg spin exchange in ESR spectra 1. Linewidth and saturation effects, J. Chem. Phys. 51, 2690-2709 (1969).