no. 3
Equisingular deformations below the Newton boundary
Compositio Mathematica, Tome 80 (1991) no. 3, pp. 257-283. 
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     author = {Altmann, Klaus},
     title = {Equisingular deformations below the {Newton} boundary},
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     pages = {257--283},
     publisher = {Kluwer Academic Publishers},
     volume = {80},
     number = {3},
     year = {1991},
     mrnumber = {1134256},
     zbl = {0751.14022},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1991__80_3_257_0/}
}
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Altmann, Klaus. Equisingular deformations below the Newton boundary. Compositio Mathematica, Tome 80 (1991) no. 3, pp. 257-283. http://archive.numdam.org/item/CM_1991__80_3_257_0/

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