@book {584,
	title = {The vegetation of the Siberian-Mongolian frontiers (the Sayansk region)},
	series = {Contributiones ad floram Asiae interioris pertinentes},
	volume = {3},
	year = {1921},
	pages = {518},
	publisher = {K. Norske Videnskabers Selskab},
	organization = {K. Norske Videnskabers Selskab},
	address = {Trondhjem},
	keywords = {distribution, habitats, Juncaginaceae (p. 116-117), Mongolia, Russian S.F.S.R, Siberia, vegetation},
	url = {http://www.biodiversitylibrary.org/item/115389},
	author = {Printz, Henrik}
}
@article {573,
	title = {Leaves of the Helobiae},
	journal = {Botanical Gazette},
	volume = {72},
	year = {1921},
	pages = {31-38},
	keywords = {Alismataceae, Aponogetonaceae, Butomaceae, Hydrocharitaceae, Juncaginaceae, Naiadaceae, Potamogetonaceae},
	url = {http://www.jstor.org/stable/2470114},
	author = {Arber, Agnes}
}
@inbook {193,
	title = {Aponogetonaceae},
	booktitle = {Flora Balearica. {\'E}tude Phytog{\'e}ographique sur les Iles Bal{\'e}ares},
	volume = {1},
	year = {1921},
	pages = {283-284},
	publisher = {Reprint Koeltz, K{\"o}nigstein 974},
	organization = {Reprint Koeltz, K{\"o}nigstein 974},
	keywords = {Balearen, Mallorca, Menorca, Triglochin maritimum, T. bulbosum, T. laxiflorum},
	author = {Knoche, Herman}
}
