“First Record of Malayaspira Kobayashi, 1958 (Mollusca, Gastropoda) in the Lower Ordovician San Juan Formation, Argentine Precordillera”. Ameghiniana, vol. 46, no. 3, Sept. 2009, pp. 567-71, https://ameghiniana.org.ar/index.php/ameghiniana/article/view/90.