[1]
R. Énay and M. K. Howarth, “Stevensites, Zittelites, and Gyrophylloceras, new generic names proposed for Stevensia Énay, 2009, Zittelia Tavera Benitez, 1985, and Gyrophyllites Wiedmann, 1963 (Mollusca: Ammonoidea)”, paleocontributions, no. 19, pp. 1–2, Apr. 2018, doi: 10.17161/1808.26312.