@article{AFST_2010_6_19_S1_221_0,
     author = {Wagner, Sven},
     title = {On the {Pierce-Birkhoff} {Conjecture} for {Smooth} {Affine} {Surfaces} over {Real} {Closed} {Fields}},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {221--242},
     publisher = {Universit\'e Paul Sabatier, Institut de math\'ematiques},
     address = {Toulouse},
     volume = {Ser. 6, 19},
     number = {S1},
     year = {2010},
     doi = {10.5802/afst.1283},
     zbl = {1210.14069},
     mrnumber = {2675729},
     language = {en},
     url = {http://archive.numdam.org/articles/10.5802/afst.1283/}
}