1. The Mesomorphic State - Liquid Crystals
2. “Molecular Structure and the Properties of Liquid Crystals.”;Gray,1962
3. “Diffraction of X-rays by Chain Molecules.”;Vainstein,1966
4. A. W. Schubnikov and W. A. Kopzik, “Symmetry in Science and Art.” Nauka, Moscow,
5. An X-ray Diffraction Study of Three Mesophases Showing Smectic A Morphology