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worldcat.org
James C. Lamsdell. Revised systematics of Palaeozoic 'horseshoe crabs' and the myth of monophyletic Xiphosura. „Zoological Journal of the Linnean Society”. 167 (1), s. 1–27, 2013. DOI: 10.1111/j.1096-3642.2012.00874.x. ISSN0024-4082.