Geodesic
Divisorial contractions to 3-dimensional $cDV$ points
Sbornik. Mathematics, Tome 193 (2002) no. 7, pp. 1091-1102

Voir la notice de l'article provenant de la source Math-Net.Ru

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. 
@article{SM_2002_193_7_a6,
     author = {I. Yu. Fedorov},
     title = {Divisorial contractions to 3-dimensional $cDV$ points},
     journal = {Sbornik. Mathematics},
     pages = {1091--1102},
     publisher = {mathdoc},
     volume = {193},
     number = {7},
     year = {2002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2002_193_7_a6/}
}
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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/