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<ref name= Olson1952>{{cite journal | first1 = C.Everett | last1 = Olson | author-link = C. Everett, Olson | year = 1952 | title = The Evolution of the Permian Vertebrate Chronofauna | journal = Evolution | volume = 6 | issue = 2 | pages = 181–196 | jstor = 2405622 | doi=10.2307/2405622}}</ref>
<ref name= Gould1973>{{cite journal | first1 = Stephan Jay | last1 = Gould | first2 = John | last2 = Littlejohn | author-link = Stephen Jay Gould and John Littlejohn | year = 1973 | title = Factor Analysis of Caseid Pelycosaurs | journal = The Journal of Geology | volume = 47 | issue = 5 | pages = 886–891 | jstor = 1303067}}</ref>
<ref name = Williston2>{{cite journal | first1 = S.W. | last1 = Williston | author-link =
<ref name = Brocklehurst1>{{cite news | first1 = Neil | last1 = Brocklehurst | first2 = Marco | last2 = Romano | first3 = Jorg | last3 = Frobisch | author-link = Brocklehurst, Neil; Romano, Marco; Frobisch, Jorg | year = 2017 | title = Principle component analysis as an alternative treatment for morphometric characters: phylogeny of Caseids as a case study, Dryad, Dataset | doi= 10.5061/dryad.qg91m}}</ref>
<ref name = Williston3>{{cite journal | first1 = S.W. | last1= Williston | author-link =
<ref name = Osborn1>{{cite journal | first1 = Henry Fairfield | last1 = Osborn | author-link = Henry Fairfield Osborn | year = 1918 | title = Samuel Wendell Williston 1852-1918 | journal = The Journal of Geology | volume = 26 | issue = 8 | pages = 673–689 | jstor = 30063514| doi = 10.1086/622630 | bibcode = 1918JG.....26..673O | s2cid = 129085529 }}</ref>
<ref name = Leblanc1>{{cite news | first1= ARH | last1 = Leblanc | first2 = RR | last2 = Reisz | year = 2014 | title = New Postcranial material of the Early Casied Casea broilii Williston, 1910 with a review of the evolution of the sacrum in Paleozoic Non Mammalian Synapsids | doi=10.1371/journal.pone.0115734| doi-access = free }}</ref>
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