Calle, Carlos, Rüdiger-A. Eichel, Cinzia Finazzo, Jörg Forrer, Josef Granwehr, Igor Gromov, Willi Groth, et al. “Electron Paramagnetic Resonance Spectroscopy”. CHIMIA 55, no. 10 (October 31, 2001): 763. Accessed April 28, 2024. https://www.chimia.ch/chimia/article/view/2001_763.