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johnmckay.blogspot.nl
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Cotton, T.J., Braddy, S.J. (2004). The phylogeny of arachnomorph arthropods and the origins of the Chelicerata. Transactions of the Royal Society of Edinburgh: Earth Sciences94 (3): 169–193. ISSN: 0263-5933. DOI: 10.1017/S0263593303000105.
Dai, T., Zhang, X. (2008). Ontogeny of the trilobite Yunnanocephalus yunnanensis from the Chengjiang lagerstätte, lower Cambrian, southwest China. Alcheringa32: 465–468. ISSN: 0311-5518. DOI: 10.1080/03115510802418057.