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Konstantin E. Mikhailov, Emily S. Bray & Karl E. Hirsch (1996). “Parataxonomy of fossil egg remains (Veterovata): basic principles and applications”. Journal of Vertebrate Paleontology16 (4): 763–769. doi:10.1080/02724634.1996.10011364. JSTOR4523773.
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O'Keefe, F.R.; Chiappe, L.M. (2011). “Viviparity and K-selected life history in a Mesozoic marine plesiosaur (Reptilia, Sauropterygia)”. Science333 (6044): 870–873. doi:10.1126/science.1205689. PMID21836013.