A3 SOLID STATE CHEMISTRY OF NEW SEMI CONDUCTORS WITH VALENCE INSTABILITIES : TmSe1-xTex AND Tm1-xEuxSe E. Kaldis and B. Fritzler J. Phys. Colloques, 41 C5 (1980) C5-135-C5-142 DOI: 10.1051/jphyscol:1980524