@article {800,
	title = {On Dugesia gonocephala from western Europe},
	journal = {Bijdragen tot de Dierkunde},
	volume = {50},
	year = {1980},
	pages = {342-350},
	author = {de Vries, Elizabeth J. and Ian R. Ball}
}
@article {799,
	title = {The karyotypes of two Dugesia species from Corfu, Greece (Platyhelminthes, Turbellaria)},
	journal = {Bijdragen tot de Dierkunde},
	volume = {48},
	number = {2},
	year = {1979},
	pages = {187-190},
	author = {Ian R. Ball}
}
@article {437,
	title = {The phyletic status of the genus <i>Planaria</i> (Platyhelminthes, Turbellaria, Tricladida)},
	journal = {Bijdragen tot de Dierkunde},
	volume = {48},
	year = {1978},
	pages = {29-34},
	chapter = {29},
	author = {Ian R. Ball and Nicole Gourbault}
}
@article {52,
	title = {On the species of the <i>Dugesia gonocephala</i> group (Platyhelminthes, Turbellaria, Tricladida) from Greece},
	journal = {Bijdragen tot de Dierkunde},
	volume = {54},
	year = {1984},
	pages = {101-126},
	chapter = {101},
	author = {de Vries, Elizabeth J.}
}
