Measurements of the ratio of the Frank constants for splay and bend in nematics of disc-like molecules: 2,3,6,7,10,11-hexakis(p-alkoxybenzoyloxy)triphenylenes
Warmerdam, T.W.; Frenkel, D.; Zijlstra, R.J.J.
(1988) Liquid crystals, volume 3, issue 3, pp. 369 - 380