@article {4548,
	title = {Stabel isotope signatures confirm carbon and nitrogen gain through ectomycorrhizas in the ghost orchid Epipogium aphyllum Swartz},
	journal = {Plant Biol.},
	volume = {13},
	year = {2011},
	month = {2011///},
	pages = {270 - 275},
	author = {Liebel, H. T. and Gebauer, G.}
}
@article {4269,
	title = {The degree of mycoheterotrophic carbon gain in green, variegated and vegetative albino individuals of Cephalanthera damasonium is related to leaf chlorophyll},
	journal = {New Phytol.},
	volume = {189},
	year = {2011},
	month = {2011///},
	pages = {790 - 796},
	author = {St{\"o}ckel, M. and Meyer, C. and Gebauer, G.}
}
