Martini 1968. Calcareous nannoplanktqn from the type Langhian Selli, R.[Ed]. Selli, R. [Ed.] Committee on Mediterranean Neogene stratigraphy. Proceedings of the fourth session., Committee on Mediterranean Neogene stratigraphy. Proceedings of the fourth session. Bologna. 19-30 Sept. 1967. Part 2. Micropaleontology. G. Geol. (Ser. 2) 35 (2):163-172,4 figs., 1968: 163-172. Chapter pagination: 163-172