S. Kazadzis, A. Bais, D. Balis, N. Kouremeti, M. Zempila, A. Arola, E. Giannakaki, A. Kazantzidis, V. Amiridis: Spatial and temporal UV irradiance and aerosol variability within the area of an OMI satellite pixel, Atmospheric Chemistry and Physics Vol 9 p.7273-7298 , 2009