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jstor.org
Moratalla, J.J. (1992). “A Quadrupedal Ornithopod Trackway from the Lower Cretaceous of La Rioja (Spain): Inferences on Gait and Hand Structure”. Journal of Vertebrate Paleontology12 (2): 150–157. doi:10.1080/02724634.1992.10011445. JSTOR4523436.