@article{10_4064_fm_159_2_161_193,
     author = {Gabriel Debs and Jean Saint Raymond},
     title = {Cofinal $\ensuremath{\Sigma}^1_1$ and $\ensuremath{\Pi}^1_1$ subsets of $\ensuremath{\omega}^\ensuremath{\omega}$},
     journal = {Fundamenta Mathematicae},
     pages = {161--193},
     publisher = {mathdoc},
     volume = {159},
     number = {2},
     year = {1999},
     doi = {10.4064/fm-159-2-161-193},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-159-2-161-193/}
}