@article{10_4064_fm_113_1_59_65,
     author = {Wojciech Guzicki},
     title = {The equivalence of definable quantifiers in second order arithmetic},
     journal = {Fundamenta Mathematicae},
     pages = {59--65},
     publisher = {mathdoc},
     volume = {113},
     number = {1},
     year = {1981},
     doi = {10.4064/fm-113-1-59-65},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-113-1-59-65/}
}