P.A.M. Andriessen, G. Banga, and E.H. Hebeda. “Isotopic Age Study of Pre-Alpine Rocks in the Basal Units on Naxos, Sikinos and Ios, Greek Cyclades”. Netherlands Journal of Geosciences, Jan. 1987, pp. 3-14, https://njgjournal.nl/index.php/njg/article/view/13087.