1. Anderson, W.A., Piette, L.H.: Forbidden ms = ±1, mI = ±1 transitions in a vanadyl chelate. J. Chem. Phys. 30, 591–592 (1959)
2. Belford, R.L., Clarkson, R.B., Cornelius, J.B., Rothenberger, K.S., Nilges, M.J., Timken, M.D.: EPR Over Three Decades of Frequency: Radiofrequency to Infrared. In: Weil, J.A., Bowman, M.K., Preston, K.F. (eds.) Electron Magnetic Resonance of the Solid State, pp. 21–43. Canadian Society for Chemistry, Ottawa (1987)
3. Bertini, I., Martini, G., Luchinat, C.: Relaxation data tabulation. In: Poole Jr., C.P., Farach, H. (eds.) Handbook of Electron Spin Resonance: Data Sources, Computer Technology, Relaxation, and ENDOR, pp. 79–310. American Institute of Physics, New York (1994a)
4. Budil, D.E., Lee, S., Saxena, S., Freed, J.H.: Nonlinear least-squares analysis of slow-motion EPR spectra in one and two dimensions using a modified Levenberg-Marquardt algorithm. J. Magn. Reson. A 120, 155–189 (1996)
5. Cordischi, D., Occhiuzzi, M., Dragone, R.: Quantitative EPR spectroscopy: comparison between primary standards and application to MgO-MnO and α-Al2O3-CrO3 solid solutions. Appl. Magn. Reson. 16, 427–445 (1999)