@article {2964,
	title = {Pollen morphology and systematic in two subfamilies of the Ericaceae, Pyroloideae and Monotropoideae},
	journal = {Korean J. Pl. Taxon.},
	volume = {18},
	year = {1988},
	month = {1988///},
	pages = {9 - 18},
	author = {Takahashi, H.}
}
@article {2735,
	title = {Vergleichende Untersuchungen zur Mycotrophie bei Gentiana verna L. und Voyria truncata (Stand.) Stand. \& Stey. (Gentianaceae)},
	journal = {Beitr. Biol. Pflanzen},
	volume = {63},
	year = {1988},
	month = {1988///},
	pages = {463 - 477},
	author = {Kn{\"o}bel, M. and Weber, H. Chr.}
}
