Rutkowska, Katarzyna Agnieszka, et al. “Wedge-Cell Technique As a Simple and Effective Method for Chromatic Dispersion Determination of Liquid Crystals”. Photonics Letters of Poland, vol. 8, no. 2, June 2016, pp. pp. 51-53, doi:10.4302/photon. lett. pl.v8i2.646.