F.R. Bianchi, B.W.M. Driever, and H.A. Jonkers. “K-Ar Date and Biostratigraphic Position of a Volcanic Ash-Layer in the Marine Pliocene of Crete, Greece ”. Netherlands Journal of Geosciences, Jan. 1985, pp. 103-11, https://njgjournal.nl/index.php/njg/article/view/13167.