@article{JEMS_2014_16_9_a2,
     author = {Jeffrey S. Geronimo and Plamen Iliev},
     title = {Fej\'er{\textendash}Riesz factorizations and the structure of bivariate polynomials orthogonal on the bi-circle},
     journal = {Journal of the European Mathematical Society},
     pages = {1849--1880},
     publisher = {mathdoc},
     volume = {16},
     number = {9},
     year = {2014},
     doi = {10.4171/jems/477},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/477/}
}