MACROSCOPIC FEATURES. a) NematicsPRESENTATION OF A FILM ENTITLED "TEXTURES OF NEMATIC AND CHOLESTERIC LIQUID CRYSTALS" Y. BOULIGAND J. Phys. Colloques, 36 C1 (1975) C1-173-C1-176 DOI: 10.1051/jphyscol:1975133