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1. Schweitzer, M., Wittmeyer, J., Horner, J. 2005. Gender-specific reproductive tissue in ratites and Tyrannosaurus rex. Science. doi: 10.1126/science.1112158

2. Fields, H. "Dinosaur Shocker". Smithsonian Magazine Online. Retrieved 2006-05-01.

3. Mary Higby Schweitzer, Wenxia Zheng, Lindsay Zanno, Sarah Werning,Toshie Sugiyama,” Chemistry supports the identification of gender-specific reproductive tissue in Tyrannosaurus rex”, Scientific Reports 6, Article number: 23099 (2016),doi:10.1038/srep23099

4. Jun 04, 2020 · A high-resolution growth series of Tyrannosaurus rex obtained from multiple lines of evidence Thomas D. Carr Department of Biology, Carthage College , Kenosha, WI , USA

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