Weiteneder, Ch.Herzig, H. P.Schilling, A.Tompkin, W.R.2009-04-222009-04-222009-04-22200210.1364/DOMO.2002.DTuD15https://infoscience.epfl.ch/handle/20.500.14299/37860Combination gratings for visual security applicationstext::conference output::conference proceedings::conference paper