Smectic A-Cholesteric liquid crystal phase transition: A density study E. L. Duarte, A. J. Palangana, R. Itri, A. R. Sampaio and A. A. Barbosa Eur. Phys. J. B, 5 4 (1998) 835-838 Published online: 15 October 1998 DOI: 10.1007/s100510050509