1. Alferdinck, J. W. A. M .; Padmos, P.: Car Headlamps: Influence of Dirt, Age and Poor Aim on Glare and Illumination Intensities. In: Lighting Res. Technol. 20, pp. 195 – 198; Sage Publications, 1988
2. Rumar, R.: Dirty Headlamps – Frequency and Visibility Effects. In: Ergonomics Vol. 17: 4, pp. 529 – 533, 1974
3. Schmidt-Clausen, H.-J.; Bindels, J. Th. H.: Die Schwellenleuchtdichte als Blendungsbewertungskriterium. In: Lichttechnik, 23. Jahrgang, Nr. 10, 1971
4. Sivak, M.; Flannagan, M. J.; Traube, E. C.; Kojima, S.; Aoki, M.: Low-beam Headlamps: Effects of Realistic Levels of Dirt on Light Output. In: Lighting Res. Technol. 29, pp. 15 – 22; Sage Publications, 1997
5. Söllner, S.; Haferkemper, N.; Weibel, T.; Khanh, T. Q.: Photometrical Measurements of Headlamps Exposed to Standard and Natural Dirt – Efficacy of Headlamp Cleaning Systems. SAE International Conference, Detroit, USA, 2010