1. R.P. Kohin, Magn. Reson. Rev. 5, 75 (1979)
2. P. Chand, V.K. Jain, G.C. Upreti, Magn. Reson. Rev. 14, 49 (1988)
3. M. Jain, Z. Naturforsch. 59a, 488 (2004)
4. A.G. Nord, Chem. Commun. (Univ. Stockholm) No. 12, 1 (1974)
5. A. Abragam, B. Bleaney, Electron Paramagnetic Resonance of Transition Ions (Clarendon Press, Oxford, 1970)