1. ASTM D 1925: Standard Test Method for Determination Yellowness Index, 70th Edition, May 1977.
2. ASTM D 1003: Standard Test Method for Haze and Luminous Transmittance of Transparent Plastics, Edition 2021.
3. Influence of material alterations machine impairment on throughput related sensor-based sorting performance;Küppers;Waste Manag. Res.,2020
4. Influence of surface roughness and surface moisture of plastics on sensor-based sorting in the near infrared range;Küppers;Waste Manag. Res.,2019
5. UV-VIS Spectroscopy and Its Applications;Perkampus,1992