1. Discovery of the cerium isotopes
2. The Nubase evaluation of nuclear and decay properties
3. ENSDF, Evaluated Nuclear Structure Data File, maintained by the National Nuclear Data Center at Brookhaven National Laboratory, published in Nuclear Data Sheets, Academic Press, Elsevier Science. http://www.nndc.bnl.gov/ensdf/.
4. Criteria that must be satisfied for the discovery of a new chemical element to be recognized
5. S. Czajkowski, F. Ameil, P. Armbruster, M. Bernas, P. Dessagne, C. Donzaud, C. Engelmann, H.R. Faust, H. Geissel, E. Hanelt, A. Heinz, M. Hesse, C. Kozhuharov, C. Miehé, G. Münzenberg, M. Pfützner, C. Röhl, K.-H. Schmidt, W. Schwab, C. Stephan, K. Sümmerer, L. Tassan-Got, B. Voss, in: Proc. Int. Conf. on Exotic Nuclei, Atomic Masses, ENAM’95, Arles, France, 1995, Editions Frontieres, 1996, p. 553.