Aiken GR, McKnight DM, Harnish RA, Wershaw R. Geochemistry of aquatic humic substances in the Lake Fryxell Basin, Antarctica. Biogeochemistry. 1996;34:157-188.

McKnight DM, Andrews ED, Spaulding SA, Aiken GR. Aquatic fulvic acids in algal-rich antarctic ponds. Limnology and Oceanography. 1994;39(8):1972-1979.

McKnight DM, Aiken GR, Andrews ED, Bowles EC, Harnish RA. Dissolved Organic Material in Dry Valley Lakes:  A Comparison of Lake Fryxell, Lake Hoare, and Lake Vanda, in Physical and Biogeochemical Processes in Antarctic Lakes. Antarctic Research Series. 1993;59:119-133.