Bühler, Niklaus, Hans-Peter Haerri, Manfred Hofmann, Christine Irrgang, Andreas Mühlebach, Beat Müller, and Friedrich Stockinger. “Nelfilcon A, a New Material for Contact Lenses”. CHIMIA 53, no. 6 (June 29, 1999): 269. Accessed April 29, 2024. https://www.chimia.ch/chimia/article/view/1999_269.