1H-NMR relaxation measurements in the organic conductors : (TMTTF)2Br and (TMTTF)2PF6 F. Creuzet, T. Takahashi, D. Jérome et J.M. Fabre J. Physique Lett., 43 21 (1982) 755-761 DOI: 10.1051/jphyslet:019820043021075500