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Wacker, S.; Gröbner, J.; Hocke, K.; Kämpfer, N.; Vuilleumier, L. (2011). Trend analysis of surface cloud-free downwelling long-wave radiation from four Swiss sites. Journal of geophysical research, 116(D10), D10104. Washington, D.C.: American Geophysical Union 10.1029/2010JD015343
