@article {7868,
	title = {Erigeron L. sectie Phalacroloma (Cass.) Cronquist in Nederland},
	journal = {Gorteria},
	volume = {2},
	year = {1964},
	month = {1964///},
	pages = {9 - 12},
	author = {S.J. Van Ooststroom and Th.J. Reichgelt}
}
@article {7869,
	title = {De in Nederland adventief gevonden vormen van Scorpiurus muricatus},
	journal = {Gorteria},
	volume = {1},
	year = {1964},
	month = {1964///},
	pages = {37 - 39},
	author = {S.J. Van Ooststroom and Th.J. Reichgelt}
}
