@article {814,
	title = {Elevated atmospheric CO2 and increased nitrogen deposition: effects on C and N metabolism and growth of the peat moss Sphagnum recurvum P. Beauv. var. mucronatum (Russ.) Warnst. },
	year = {2000},
	pages = {201-212},
	author = {Van Der Heijden, E. and Verbeek, S.J. and Kuiper, P.J.C.}
}
@article {715,
	title = {Inter actions of elevated CO2, NH3 and O3 on mycorrhizal infection, gas exchange and N metabolism in seedlings of Scots pine},
	volume = {176},
	year = {1995},
	pages = {107-116},
	author = {Pirez-Soba, M. and Dueck, T.A. and Puppi, G. and Kuiper, P.J.C.}
}
@article {1682,
	title = {Interactions of elevated CO2, NH3 and O3 on mycorrhizal infection, gas exchange and N metabolism in saplings of Scots pine.},
	volume = {176},
	year = {1995},
	pages = {107-116},
	author = {Perez-Soba, M and Dueck, T.A. and Puppi, G. and Kuiper, P.J.C.}
}
