Cawley KM, McKnight DM, Miller PL, et al. Characterization of fulvic acid fractions of dissolved organic matter during ice-out in a hyper-eutrophic, coastal pond in Antarctica. Environmental Research Letters. 2013;8(4):045015. doi:10.1088/1748-9326/8/4/045015.

D?Andrilli J, Foreman CM, Marshall AG, McKnight DM. Characterization of IHSS Pony Lake fulvic acid dissolved organic matter by electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry and fluorescence spectroscopy. Organic Geochemistry. 2013;65:19 - 28. doi:10.1016/j.orggeochem.2013.09.013.

Fulton J, McKnight DM, Foreman CM, Cory RM, Stedmon C, Blunt E. Changes in fulvic acid redox state through the oxycline of a permanently ice-covered Antarctic lake. Aquatic Sciences. 2004;66:1-20.