Structural Study of the Nematic and Hexagonal Columnar Phases of Wire Shaped Self Assemblies of Thermotropic Mesogens Pierre-Antoine Albouy, Daniel Guillon, Benoît Heinrich, Anne-Marie Levelut et Jacques Malthête J. Phys. II France, 5 11 (1995) 1617-1634 DOI: 10.1051/jp2:1995203