Malchus, Nikolaus. “The Meaning of `inversion` in Chamids and Rudists (Bivalvia) Reviewed and an Unbiassed Theoretical Approach to Late Jurassic-Early Cretaceous Rudist Phylogeny”. Revista Mexicana De Ciencias Geológicas, vol. 12, no. 2, Feb. 2019, pp. 211-23, https://www.rmcg.unam.mx/index.php/rmcg/article/view/1194.