@book {531,
	title = {Contributions to Pteropodernes},
	series = {Morphology of Systematic and for knowledge of their geographical distribution},
	volume = {4},
	year = {1886},
	pages = {1-231},
	publisher = {Spolia Atlantica-Vidensk},
	organization = {Spolia Atlantica-Vidensk},
	edition = {1},
	author = {J.E.V. Boas}
}
@book {549,
	title = {Pseudothecosomata, gymnosomata and heteropoda (gastropoda)},
	year = {1976},
	pages = {484},
	publisher = {Bohn, Scheltema \& Holkeme Utrecht},
	organization = {Bohn, Scheltema \& Holkeme Utrecht},
	address = {Amsterdam},
	isbn = {9031301760},
	author = {S. Van Der Spoel}
}
@article {559,
	title = {Les Gymnosomes I. Carlsberg Foundation{\textquoteright}s Oceanographical Expedition Round the World 1928-30 and Previous "Dana"-Expeditions},
	number = {20},
	year = {1942},
	pages = {11-47},
	publisher = {The Carlsberg Foundation},
	author = {A. Pruvot-Fol}
}
