@article{MM2_1990__69_1_155568,
     author = {Dirk Ballaerts},
     title = {An estimate of approximation constants for p-adic and real varities.},
     journal = {Manuscripta mathematica},
     pages = {411--442},
     publisher = {mathdoc},
     volume = {69},
     number = {1},
     year = {1990},
     url = {http://geodesic.mathdoc.fr/item/MM2_1990__69_1_155568/}
}