Ito, S., Kremer, F., Fischer, T., & Knoll, W. (1995). Guided optical waves in a ferroelectric liquid crystal layer: A birefringence analysis of molecular orientation on the switching process. Molecular Crystals and Liquid Crystals Science and Technology Section A-Molecular Crystals and Liquid Crystals, 264, 99-114. doi:10.1080/10587259508037305.