LIGHT-INDUCED PHASE TRANSITIONS AND INTRINSIC OB AND INSTABILITIES IN LIQUID CRYSTALS S.M. ARAKELIAN, Y.S. CHILINGARIAN and A.S. KARAIAN J. Phys. Colloques, 49 C2 (1988) C2-499-C2-504 DOI: 10.1051/jphyscol:19882117