| Oliver Wings No gastric mill in sauropod dinosaurs: new evidence from analysis of gastrolith mass and function in ostrichesOliver Wings Institut für Paläontologie, Universitat Bonn, Nussallee 8, 53115 Bonn, Germany Proc Biol Sci 274:635-40. 2007 Gastroliths in Yanornis: an indication of the earliest radical diet-switching and gizzard plasticity in the lineage leading to living birds?Zhonghe Zhou Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, PO Box 643, 100044, Beijing, China Naturwissenschaften 91:571-4. 2004
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