@article {168,
	title = {Reaction of mycorrhizal and non-mycorrhizal Scots Pine fine roots along a deposition gradient of air pollutants in eastern Germany},
	journal = {Water, Air and Soil Pollution},
	volume = {85},
	year = {1995},
	pages = {1191-1196},
	author = {Munzenberger, B. and Schminke, B. and Strubelt, F. and Huettl, R.F.}
}
@article {1558,
	title = {Forest decline, nutrient supply and diagnostic fertilisation in southwestern Germany and in southern California. },
	journal = {Forest Ecology and Management},
	volume = {30},
	year = {1990},
	pages = {341-350},
	author = {Huettl, R.F. and Fink, S. and Lutz, H.J. and Poth, M. and Wisniewski, J.}
}
