@article{10_4064_fm232_1_6,
     author = {Jonathan Kirby},
     title = {The rational field is not universally definable in pseudo-exponentiation},
     journal = {Fundamenta Mathematicae},
     pages = {79--88},
     publisher = {mathdoc},
     volume = {232},
     number = {1},
     year = {2016},
     doi = {10.4064/fm232-1-6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm232-1-6/}
}