@article {574,
	title = {Report on the Invertebrates of Massachusetts},
	number = {1},
	year = {1870},
	pages = {1-35},
	publisher = {Wight \& Potter State Printers},
	address = {Boston},
	author = {A.A. Gould}
}
@article {572,
	title = {Pteropoda},
	journal = {Tiefsee Exp. 1898-1899},
	volume = {4},
	year = {1905},
	pages = {314},
	chapter = {1},
	author = {J. Meisenheimer}
}
@book {554,
	title = {Euthecosomata, a group with remarkable developmental stages (Gastropoda, Pteropoda)},
	year = {1967},
	pages = {375},
	publisher = {J. Noorduyn \& ZN, Gorinchem},
	organization = {J. Noorduyn \& ZN, Gorinchem},
	author = {S. Van Der Spoel}
}
