The Fermi Surfaces of β-(BEDT-TTF)2X J. Wosnitza, G. Goll, D. Beckmann, S. Wanka, D. Schweitzer and W. Strunz J. Phys. I France, 6 12 (1996) 1597-1608 Accepted: 01 July 1996 DOI: 10.1051/jp1:1996177