Observation of the parabolic focal conic structure and a disclination/dislocation relationship in a dilute lyotropic phase W.J. Benton, E.W. Toor, C.A. Miller et T. FortJ. Phys. France, 40 1 (1979) 107-110DOI: https://doi.org/10.1051/jphys:01979004001010700