Driscoll, Charles, Gene Likens, Lars Hedin, and Herbert Bormann. 1989. “Surface Water Chemistry. Reply to Comments”. Environmental Science & Technology 23: 754–759. Referenced from pubs.acs.org: Surface water chemistry. Reply to comments.

Hedin, Lars, Lennart Granat, Gene Likens, and Henning Rodhe. 1990. “Strong Similarities in Seasonal Concentration Ratios of SO42-, NO3- and NH4+ in Precipitation Between Sweden and the Northeastern US*”. Tellus B 42: 454–462. Referenced from onlinelibrary.wiley.com: Strong similarities in seasonal concentration ratios of SO42-, NO3- and NH4+ in precipitation between Sweden and the northeastern US*.

Likens, Gene, Herbert Bormann, Lars Hedin, Charles Driscoll, and John Eaton. 1990. “Dry Deposition of Sulfur: A 23-Year Record for the Hubbard Brook Forest Ecosystem”. Tellus B 42: 319–329. Referenced from onlinelibrary.wiley.com: Dry deposition of sulfur: a 23-year record for the Hubbard Brook Forest ecosystem.

Hedin, Lars, Gene Likens, and Herbert Bormann. 1987. “Decrease in Precipitation Acidity Resulting from Decreased SO2- 4 Concentration”. Nature 325: 244–246. Referenced from www.nature.com: Decrease in precipitation acidity resulting from decreased SO2- 4 concentration.

Bernal, Susana, Lars Hedin, Gene Likens, Stefan Gerber, and Don Buso. 2012. “Complex Response of the Forest Nitrogen Cycle to Climate Change”. Proceedings of the National Academy of Sciences 109: 3406–3411. Referenced from www.pnas.org: Complex response of the forest nitrogen cycle to climate change.

Hedin, Lars, and Gene Likens. 1996. “Atmospheric Dust and Acid Rain”. Scientific American 275: 88–92. Referenced from www.nature.com: Atmospheric dust and acid rain.

Driscoll, Charles, Gene Likens, Lars Hedin, John Eaton, and Herbert Bormann. 1989. “Changes in the Chemistry of Surface Waters”. Environmental Science & Technology 23: 137–143. Referenced from pubs.acs.org: Changes in the chemistry of surface waters.