Ando, Yusuke. “Oligocene Pteropods (Gastropoda: Thecosomata) from the Kishima Formation, Saga Prefecture, Southwest Japan”. Revista Mexicana De Ciencias Geológicas, vol. 28, no. 2, Feb. 2014, https://rmcg.geociencias.unam.mx/index.php/rmcg/article/view/200.