Birefringence and order parameter in nematic N-p-cyanobenzylidene-p-octyloxyaniline C.C. Huang, R.S. Pindak et J.T. HoJ. Physique Lett., 35 10 (1974) 185-187DOI: https://doi.org/10.1051/jphyslet:019740035010018500
