@article{GDZPPN002334232, title = {On the spectrum of C1b (E).}, journal = {Mathematische Annalen}, volume = {287}, year = {1990}, pages = {531-538}, zbl = {0681.46037}, url = {http://dml.mathdoc.fr/item/GDZPPN002334232} }
Jaramillo, Jesús A.; Llavona, José G. On the spectrum of C1b (E).. Mathematische Annalen, Tome 287 (1990) pp. 531-538. http://gdmltest.u-ga.fr/item/GDZPPN002334232/