@article {1688,
	title = {Humic substances in groundwater.},
	journal = {Abstracts of Papers of the American Chemical Society},
	volume = {186},
	year = {1983},
	pages = {89-ENVR},
	author = {Thurman, E.M. and Malcolm, R.L.}
}
@article {1687,
	title = {Preparative isolation of aquatic humic substances.},
	journal = {Environmental Science and technology},
	volume = {15},
	year = {1981},
	pages = {463-466},
	author = {Thurman, E.M. and Malcolm, R.L.}
}
