Effects of ferromagnetic inclusions on 'ANTPOT.13 C'MAS NMR spectra of heat-treated peat samples - Freitas, Jair Carlos Checon de; Passamani, Edson C; Orlando, Marcos T. D.; Emmerich, Francisco G; Garcia, Flávio; Sampaio, Luiz C; Bonagamba, Tito José (Energy and Fuels, 2002)