Template:Ramsköld & Werdelin, 1991

• Ramsköld, L. & Werdelin, L. 1991. The Phylogeny and Evolution of some Phacopid Trilobites. Cladistics 7(1): 29–74. DOI: 10.1111/j.1096-0031.1991.tb00021.x  
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