X-RAY STUDY OF PHASE TRANSITION INVOLVING ORDERED BIAXIAL PHASES G. ALBERTINI, B. DUBINI, S. MELONE, M. G. PONZI-BOSSI, F. RUSTICHELLI et G. TORQUATIJ. Phys. Colloques, 40 C3 (1979) C3-384-C3-388DOI: https://doi.org/10.1051/jphyscol:1979376