@article{DOCMA_2005__10__a18,
     author = {Knebusch, Manfred and Zhang, Digen},
     title = {Convexity, valuations and {Pr\"ufer} extensions in real algebra},
     journal = {Documenta mathematica},
     pages = {1--109},
     publisher = {mathdoc},
     volume = {10},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DOCMA_2005__10__a18/}
}