@misc{Institute_of_Meteorology_and_Water_Management._National_Research_Institute_Godzinne_1998, author={Institute of Meteorology and Water Management. National Research Institute}, editor={Polish Academy od Sciences. Institute of Dendrology}, editor={Przybył, Urszula. Data registering person}, copyright={Creative Commons Attribution BY-SA 4.0 license}, howpublished={online}, year={1998}, language={pol}, title={Godzinne wartości usłonecznienia. Kwiecień 1998}, type={Image}, URL={http://www.rcin.org.pl/Content/159665/PDF/KOR001_183177.pdf}, keywords={climatology, meteorology, weather station, insolation}, }