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web.archive.org
Hooge et al. Molecular systematics of the Acoela (Acoelomorpha, Platyhelminthes) and its concordance with morphology. „Molecular Phylogenetics and Evolution”. 24, s. 333–342, 2002. DOI: 10.1016/S1055-7903(02)00236-1. (ang.).(pdf)