@book {pdf,
	title = {Salt-marsh Turbellaria},
	series = {Biology of the Turbellaria},
	year = {1974},
	note = {2872},
	pages = {229-247},
	publisher = {McGraw-Hill},
	organization = {McGraw-Hill},
	type = {incollection},
	address = {New York},
	abstract = {Mentions:
Macrostomum balticum
Macrostomum hamatum
Macrostomum hystricinum
Macrostomum pusillum
Macrostomum spirale
Macrostomum tenuicauda},
	keywords = {Macrostomum},
	author = {den Hartog, C},
	editor = {Riser, N W and Morse, M P}
}
@article {pdf,
	title = {Turbellaria from intertidal flats and salt-marshes in estuaries of the south-western part of the Netherlands},
	journal = {Hydrobiologia},
	volume = {52},
	number = {1},
	year = {1977},
	note = {2873},
	pages = {29-32},
	type = {article},
	abstract = {Mentions:
Microstomum lineare
Microstomum sp.
Macrostomum balticum
Macrostomum distinguendum
Macrostomum finlandense
Macrostomum hamatum
Macrostomum hystricinum
Macrostomum pusillum
Macrostomum rostratum
Macrostomum spirale
Macrostomum tenuicauda},
	keywords = {Macrostomum},
	author = {den Hartog, C}
}
