FLUX GROWTH, ANALYSIS AND CRYSTALLOGRAPHIC ASPECTS OF ALKALI RARE EARTH SULFIDES A. W. VERHEIJEN, W. J. P. VAN ENCKEVORT, J. BLOEM et L. J. GILING J. Phys. Colloques, 36 C3 (1975) C3-39-C3-45 DOI: 10.1051/jphyscol:1975309