@article{GDZPPN002060434, title = {The Spectra of Hyponormal Integral Operators}, journal = {Commentarii mathematici Helvetici}, volume = {46}, year = {1971}, pages = {451-456}, zbl = {0228.47035}, url = {http://dml.mathdoc.fr/item/GDZPPN002060434} }
Putnam, C.R.; Clancey, K.F. The Spectra of Hyponormal Integral Operators. Commentarii mathematici Helvetici, Tome 46 (1971) pp. 451-456. http://gdmltest.u-ga.fr/item/GDZPPN002060434/