1. Solar irradiation of surfaces on clear days;Threlkeld;Trans. of ASHRAE,1963
2. Solar radiation on inclined surfaces;Norris;Solar Energy,1966
3. A new simplified version of the Perez diffuse irradiance model for tilted surfaces;Perez;Solar Energy,1987
4. Empirical study of the angular distribution of sky radiance and of ground reflected radiation fluxes;Valko,1983
5. Joint analysis of simultaneous sky radiance and slope irradiance measurements from different sites in Europe;Valko,1989