Measurements of density and x-ray scattering near the smectic a-cholesteric phase transition - Duarte, E L; Barbosa, A Aildes Lorenzo Lopo; Vieira, Evanine Estrella Fachini; Itri, Rosangela; Palangana, A J (Workshop Iberoamericano de Fluidos Complejos y sys Aplicaciones, 1997)