@article {1203,
	title = {The North American species of Massalongia and generic relationships},
	journal = {Canadian Journal of Botany},
	volume = {41},
	number = {1331-1346},
	year = {1963},
	author = {Aino Henssen}
}
@article {1377,
	title = {Study of the genus Koerberia},
	journal = {Canadian Journal of Botany},
	volume = {41},
	year = {1963},
	pages = {1347-1357},
	author = {Aino Henssen}
}
@article {1214,
	title = {A study of the genus Vestergrenopsis},
	journal = {Canadian Journal of Botany},
	volume = {41},
	year = {1963},
	pages = {13359-13366},
	chapter = {13359},
	author = {Aino Henssen}
}
