@article{10_4064_fm_109_1_37_53,
     author = {Alan Taylor},
     title = {On saturated sets of ideals and {Ulam's} problem},
     journal = {Fundamenta Mathematicae},
     pages = {37--53},
     publisher = {mathdoc},
     volume = {109},
     number = {1},
     year = {1980},
     doi = {10.4064/fm-109-1-37-53},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-109-1-37-53/}
}