@article{02095722,
title = {The free cover of a row contraction.},
journal = {Documenta Mathematica},
volume = {9},
year = {2004},
pages = {137-161},
zbl = {1049.46044},
language = {en},
url = {http://dml.mathdoc.fr/item/02095722}
}
Arveson, William. The free cover of a row contraction.. Documenta Mathematica, Tome 9 (2004) pp. 137-161. http://gdmltest.u-ga.fr/item/02095722/