Brinkhuis, H., Powell, A.J. and Zevenboom, D.,
1992
High resolution dinoflagellate cyst stratigraphy of the Oligocene/Miocene transition interval in northwest and central Italy.
In: Head, M.J. and Wrenn, J.H. (editors), Neogene and Quaternary Dinoflagellate Cysts and Acritarchs, p.219-258, pl.1-10; American Association of Stratigraphic Palynologists Foundation, Dallas, U.S.A.