Optical radiation physics and illumination Engineering - Supplement 1: Index of quantities, symbols and units; and subject index to DIN 5031 part 1 to part 11— 24 стр.
Ophthalmic optics and instruments - Anomaloscopes for the diagnosis of congenital defects of red-green-colour vision and aquired disorders - Fundamental requirements; Text in German and English— 17 стр.