Geodesic
Divisorial contractions to 3-dimensional $cDV$ points
Sbornik. Mathematics, Tome 193 (2002) no. 7, pp. 1091-1102 Cet article a éte moissonné depuis la source Math-Net.Ru

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Divisorial contractions to singularities of the forms $xy+z^n+u^n=0$ with $n\geqslant 3$ and $xy+z^3+u^4=0$ are classified in the Mori category. 
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I. Yu. Fedorov. Divisorial contractions to 3-dimensional $cDV$ points. Sbornik. Mathematics, Tome 193 (2002) no. 7, pp. 1091-1102. http://geodesic.mathdoc.fr/item/SM_2002_193_7_a6/

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