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Jamieson, B.G.M. (1978). Phylogenetic and phenetic systematics of the opisthoporous Oligochaeta (Annelida: Clitellata). Evolutionary Theory. 3: 195-233.
Jamieson, B.G.M. (1978). Phylogenetic and phenetic systematics of the opisthoporous Oligochaeta (Annelida: Clitellata). Evolutionary Theory. 3: 195-233.