M. Kejna, R. Przybylak, and A. Araźny, “The Influence of Cloudiness and Synoptic Situations on the Solar Radiation Balance in the Area of Kaffiøyra (Nw Spitsbergen) in the Summer Seasons 2010 and 2011”, BOGPGS, no. 5, pp. 77–95, Dec. 2012.