@article{MZ_1991__207_2_174256,
     author = {Patrick J. Morandi},
     title = {An approximation theorem for {Dubrovin} valuation rings.},
     journal = {Mathematische Zeitschrift},
     pages = {71--82},
     publisher = {mathdoc},
     volume = {207},
     number = {2},
     year = {1991},
     zbl = {0713.16010},
     url = {http://geodesic.mathdoc.fr/item/MZ_1991__207_2_174256/}
}