@article{00639842,
title = {Quasi-orthogonality on the unit circle and semi-classical forms.},
journal = {Portugaliae Mathematica. Nova S\'erie},
volume = {51},
year = {1994},
pages = {47-62},
zbl = {0812.42013},
language = {en},
url = {http://dml.mathdoc.fr/item/00639842}
}
Alfaro, Manuel; Moral, Leandro. Quasi-orthogonality on the unit circle and semi-classical forms.. Portugaliae Mathematica. Nova Série, Tome 51 (1994) pp. 47-62. http://gdmltest.u-ga.fr/item/00639842/