@article{JRAM_1980__320_152289,
     author = {Douglas N. Clark},
     title = {On a similarity theory for rational {Toeplitz} operators.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {6--31},
     publisher = {mathdoc},
     volume = {320},
     year = {1980},
     zbl = {0441.47038},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1980__320_152289/}
}