@article {1767,
	title = {Die Pyuriden (Halocynthiiden) des Naturhistorischen Museums zu Hamburg},
	journal = {Jahrbuch der Hamburgischen Wissenschaflichen Australten. XXV. 1907},
	volume = {25},
	year = {1908},
	pages = {227-287},
	author = {Michaelsen, W.}
}
@article {1668,
	title = {Ascidiae Diktyobranchiae und Ptychobranchiae},
	journal = {Fauna Sudwest-Australia},
	volume = {5},
	year = {1928},
	pages = {251-460},
	author = {Hartmeyer, R. and Michaelsen, W.}
}
@article {1667,
	title = {Revision von Heller{\textquoteright}s Ascidien-Typen aus dem Museum Godefroy},
	journal = {Zoologische Jahrbuecher (suppl) },
	volume = {8},
	year = {1905},
	pages = {71-120},
	author = {Michaelsen, W.}
}
