Georgescu, Marius Dan; Abramovich, Sigal (2009): A new Late Cretaceous (Maastrichtian) serial planktic foraminifer (family Heterohelicidae) with early planispiral coil and revision of Spiroplecta Ehrenberg, 1844. Elsevier on behalf of Universite Claude Bernard, Departement des Sciences de la Terre, Lyon, France, Geobios, 42 (6), 687-698, georefid:2011-035480