Dammann, Hans <i>Electro-Optic and Magneto-Optic Materials II : 12-13 March 1990, the Hague, the Netherlands : Proceedings, ECO3, the Congress of Eps--European Physical Society, Europtica--The European Federation for Applied Optics, Spie--The International Society for Opti.</i> [Place of publication not identified]: SPIE, 1990.