NEW SYNTHETIC APPROACHES TO TETRATHIAFULVALENE DERIVATIVES: SYSTEMATIC MODIFICATIONS OF BEDT-TTF AND TMTTF DONORS R.R. Schumaker, V.Y. Lee and E.M. Engler J. Phys. Colloques, 44 C3 (1983) C3-1139-C3-1145 DOI: 10.1051/jphyscol/1983156