Tricritical-like behavior of the nonlinear optical refraction at the nematic-isotropic transition in the E7 thermotropic liquid crystalV. M. Lenart, S. L. Gómez, I. H. Bechtold, A. M. Figueiredo Neto and S. R. SalinasEur. Phys. J. E, 35 1 (2012) 4DOI: https://doi.org/10.1140/epje/i2012-12004-3