@article{10_4064_fm_133_1_81_95,
     author = {Z. Ratajczyk},
     title = {Functions provably total in $I^{-}\ensuremath{\Sigma}_{n}$},
     journal = {Fundamenta Mathematicae},
     pages = {81--95},
     publisher = {mathdoc},
     volume = {133},
     number = {1},
     year = {1989},
     doi = {10.4064/fm-133-1-81-95},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-133-1-81-95/}
}