Farinacci 1969. The smallest planktonic calcareous forms of Jurassic micrites. Bronnimann, P.; Renz, H. H.[Eds]. Proceedings of the First International Conference on Planktonic Microfossils. Geneva 1967. 2., Proceedings of the First International Conference on Planktonic Microfossils. Geneva 1967. 2. E. J. Brill, Leiden, 1967 [1969]., 1969: 224-228. Chapter pagination: 224-228