@article{GDZPPN002209039,
title = {Spectral pictures of operators quasisimilar to the unilateral shift.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {416},
year = {1991},
pages = {1-20},
zbl = {0777.47015},
url = {http://dml.mathdoc.fr/item/GDZPPN002209039}
}
Agler, J.; Franks, E.; Herrero, D.A. Spectral pictures of operators quasisimilar to the unilateral shift.. Journal für die reine und angewandte Mathematik, Tome 416 (1991) pp. 1-20. http://gdmltest.u-ga.fr/item/GDZPPN002209039/