@article{10_4064_ba55_4_2,
     author = {Jeffry L. Hirst},
     title = {Representations of {Reals} in {Reverse} {Mathematics}},
     journal = {Bulletin of the Polish Academy of Sciences. Mathematics},
     pages = {303--316},
     publisher = {mathdoc},
     volume = {55},
     number = {4},
     year = {2007},
     doi = {10.4064/ba55-4-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ba55-4-2/}
}