@article{10_4064_fm_72_1_79_95,
     author = {Harvey Friedman},
     title = {Determinateness in the low protective hierarchy},
     journal = {Fundamenta Mathematicae},
     pages = {79--95},
     publisher = {mathdoc},
     volume = {72},
     number = {1},
     year = {1971},
     doi = {10.4064/fm-72-1-79-95},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-72-1-79-95/}
}