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WikiPedia: Elasmosauridae http://www.bio.ucalgary.ca/contact/faculty/pdf/rus... http://www.palaeos.com/Vertebrates/Units/220Lepido... http://www.sciencedirect.com/science/article/pii/S... http://www.science.marshall.edu/okeefef/PDFS/OKeef... http://www.bioone.org/doi/abs/10.1671/0272-4634(20... //doi.org/10.1016%2Fj.gr.2010.10.005 //doi.org/10.1671%2F0272-4634(2005)025%5B0792:ANEP... //doi.org/10.1671%2F039.029.0118 https://web.archive.org/web/20070714234015/http://...