4Sun-photometer research, Istituto di Scienze dell′Atmosfera e dell′Oceano-Institute of Atmospheric and Oceanic Sciences, http://www.isao.bo. cnr.it/~ radiclim/fotometl.html
5SP01 for Narrowband Spectral Solar Radiation Measurement; SP01-A for Narrowband Solar Aureole Measurement, http://www.carterscott.com.au
6Sun Photometer Model SPUV BULLETIN SPUV6-10, http://www.yesinc.com