Wind, R.A.; Li, L.; Maciel, G.E.; Wooten, J.B. (1993). "Characterization of Electron Spin Exchange Interactions in Cellulose Chars by Means of ESR, 1H NMR, and Dynamic Nuclear Polarization". Applied Magnetic Resonance. 5 (2): 161–176. doi:10.1007/BF03162519. ISSN0937-9347. S2CID96672106.
Wind, R.A.; Li, L.; Maciel, G.E.; Wooten, J.B. (1993). "Characterization of Electron Spin Exchange Interactions in Cellulose Chars by Means of ESR, 1H NMR, and Dynamic Nuclear Polarization". Applied Magnetic Resonance. 5 (2): 161–176. doi:10.1007/BF03162519. ISSN0937-9347. S2CID96672106.
Wind, R.A.; Li, L.; Maciel, G.E.; Wooten, J.B. (1993). "Characterization of Electron Spin Exchange Interactions in Cellulose Chars by Means of ESR, 1H NMR, and Dynamic Nuclear Polarization". Applied Magnetic Resonance. 5 (2): 161–176. doi:10.1007/BF03162519. ISSN0937-9347. S2CID96672106.