@article{MZ_1995__220_1_174799,
     author = {Bruce Reznick},
     title = {Uniform denominators in {Hilbert's} {Seventeenth} {Problem.}},
     journal = {Mathematische Zeitschrift},
     pages = {75--98},
     publisher = {mathdoc},
     volume = {220},
     number = {1},
     year = {1995},
     zbl = {0828.12002},
     url = {http://geodesic.mathdoc.fr/item/MZ_1995__220_1_174799/}
}