LANDAU THEORY OF PRESSURE INDUCED PHASE TRANSITIONS IN TTF-TCNQ S. Megtert, A. Bjelis, J. Przystawa and S. Barisic J. Phys. Colloques, 44 C3 (1983) C3-1345-C3-1348 DOI: 10.1051/jphyscol/1983012