Columnar to nematic mesophase transition in mixtures of rhodium or copper soaps with hydrocarbon solvents M. Ibn-Elhaj, D. Guillon, A. Skoulios, A. M. Giroud-Godquin and J.-C. Marchon J. Phys. II France, 2 12 (1992) 2197-2206 DOI: 10.1051/jp2:1992260