Petkov, B.; Vitale, V.; Tomasi, C.; Bonaf, U.; Scaglione, S.; Flori, D.; Santaguida, R.; Gausa, M.; Hansen, G.; Colombo, T. (2006). Narrowband filter radiometer for ground-based measurements of global ultraviolet solar irradiance and total ozone. Applied optics, 45(18), 4383–4395.