@article{10_4064_fm_82_2_175_189,
     author = {W. Marek},
     title = {Stable sets, a characterization of $\ensuremath{\beta}_2$-models of full second order arithmetic and some related facts},
     journal = {Fundamenta Mathematicae},
     pages = {175--189},
     publisher = {mathdoc},
     volume = {82},
     number = {2},
     year = {1974},
     doi = {10.4064/fm-82-2-175-189},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-82-2-175-189/}
}