no. 1
Families of varieties with prescribed singularities
Compositio Mathematica, Tome 69 (1989) no. 1, pp. 83-110. 
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     author = {Greuel, Gert-Martin and Karras, Ulrich},
     title = {Families of varieties with prescribed singularities},
     journal = {Compositio Mathematica},
     pages = {83--110},
     publisher = {Kluwer Academic Publishers},
     volume = {69},
     number = {1},
     year = {1989},
     mrnumber = {986814},
     zbl = {0684.32015},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1989__69_1_83_0/}
}
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Greuel, Gert-Martin; Karras, Ulrich. Families of varieties with prescribed singularities. Compositio Mathematica, Tome 69 (1989) no. 1, pp. 83-110. http://archive.numdam.org/item/CM_1989__69_1_83_0/

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