H. Rodhe

Steep declines in atmospheric base cations in regions of Europe and North America
Hedin, L. O., L. Granat, Gene E. Likens, T.A. Buishand, J.N. Galloway, Tom Butler, and H. Rodhe. 1994. “Steep Declines in Atmospheric Base Cations in Regions of Europe and North America”. Nature 367: 351-54.
Strong similarities in seasonal concentration ratios of SO42-, NO3- and NH4+ in precipitation between Sweden and the northeastern United States
Hedin, L. O., L. Granat, Gene E. Likens, and H. Rodhe. 1990. “Strong Similarities in Seasonal Concentration Ratios of SO42-, NO3- and NH4+ in Precipitation Between Sweden and the Northeastern United States”. Tellus 42B: 454-62.