W. J. Kennedy and H. C. Klinger, “On the ammonite genus Rusoceras van Hoepen, 1946, a synonym of Pervinquieria (Pervinquieria) Böhm, 1910, from the Upper Albian of KwaZulu-Natal, South Africa”, agp, vol. 76, no. 3, p. e90, Sep. 2026.