X-ray mono-Laue investigations of KAlF4 and RbAlF4 : analysis of the displacive and martensitic transformations A. Gibaud, A. Bulou, C. Launay et J. Nouet J. Phys. France, 48 4 (1987) 625-633 DOI: 10.1051/jphys:01987004804062500