1. Reitz, D.C., Weissman, S.I.: J. Chem. Phys. 33 (1960) 700 Biradicals, spin Hamiltonian
2. Briere, R., Dupeyre, R.M., Lemaire, H., Morat, C., Rassat, A., Rey, P.: Bull. Soc. Chim. Fr. 1965, 3290 Biradicals, analysis of ESR spectra
3. Falle, H.R., Luckhurst, G.R., Lemaire, H., Marechal, Y., Rassat, A., Rey, P.: Mol. Phys. 11 (1966) 49 Biradicals, ESR in liquid crystals
4. Luckhurst, G.R.: Mol. Phys. 10 (1966) 543 Biradicals, alternating linewidths
5. Glarum, S.H., Marshall, J.H.: J. Chem. Phys. 47 (1967) 1374 Biradicals, spin exchange