@article{01583307,
title = {Minimal distortion problems for classes of unitary matrices.},
journal = {ELA. The Electronic Journal of Linear Algebra [electronic only]},
volume = {8},
year = {2001},
pages = {26-46},
zbl = {0978.15029},
language = {en},
url = {http://dml.mathdoc.fr/item/01583307}
}
Bolotnikov, Vladimir; Li, Chi-Kwong; Rodman, Leiba. Minimal distortion problems for classes of unitary matrices.. ELA. The Electronic Journal of Linear Algebra [electronic only], Tome 8 (2001) pp. 26-46. http://gdmltest.u-ga.fr/item/01583307/