@article{PORMA_1994__51_1_47142,
     author = {Alfaro, Manuel and Moral, Leandro},
     title = {Quasi-orthogonality on the unit circle and semi-classical forms.},
     journal = {Portugaliae mathematica},
     pages = {47--62},
     publisher = {mathdoc},
     volume = {51},
     number = {1},
     year = {1994},
     zbl = {0812.42013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1994__51_1_47142/}
}