@article{10_4064_fm_48_3_313_320,
     author = {C. Spector},
     title = {Hyperarithmetical quantifiers},
     journal = {Fundamenta Mathematicae},
     pages = {313--320},
     publisher = {mathdoc},
     volume = {48},
     number = {3},
     year = {1959},
     doi = {10.4064/fm-48-3-313-320},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-48-3-313-320/}
}