PHASE SEPARATION BEHAVIOUR OF SPECIAL BASE GLASSES - A CONTRIBUTION TO THE DEVELOPMENT OF BIOACTIVE GLASS CERAMICS W. Vogel, W. Höland, L. Horn et G. Völksch J. Phys. Colloques, 46 C8 (1985) C8-515-C8-520 DOI: 10.1051/jphyscol:1985881