@article{10_4064_fm177_3_3,
     author = {Harvey M. Friedman},
     title = {Three-quantifier sentences},
     journal = {Fundamenta Mathematicae},
     pages = {213--240},
     publisher = {mathdoc},
     volume = {177},
     number = {3},
     year = {2003},
     doi = {10.4064/fm177-3-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm177-3-3/}
}