1. An introduction to solar radiation;Iqbal,1983
2. UV-index for the public;Vanicek,2000
3. Global solar UV index: a practical guide, report NLM class: QT 162.U4;World Health Organization (WHO),2002
4. Scatter and filtered solar UV measurements;Parisi,2004
5. Revised instruction manual on radiation instruments and measurements;Fröhlich,1986