@inbook {Gelder1990_193,
	title = {An assessment of the phylogeny of the Branchiobdellida (Annelida: Clitellata), using PAUP},
	booktitle = {Canadian Journal of Zoology},
	volume = {68},
	year = {1990},
	pages = {1318{\textendash}1326},
	author = {Gelder, S. R. and Brinkhurst, R. O.}
}
