Geodesic
$\mathbb Q$-factorial quartic threefolds
Sbornik. Mathematics, Tome 198 (2007) no. 8, pp. 1165-1174

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

It is proved that a nodal quartic threefold $X$ containing no planes is $\mathbb Q$-factorial if it has at most 12 singular points. An exception here is a quartic with precisely 12 singularities containing a quadric surface. Some geometric constructions relating to such a quartic are presented. Bibliography: 14 titles. 
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     author = {K. A. Shramov},
     title = {$\mathbb Q$-factorial quartic threefolds},
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K. A. Shramov. $\mathbb Q$-factorial quartic threefolds. Sbornik. Mathematics, Tome 198 (2007) no. 8, pp. 1165-1174. http://geodesic.mathdoc.fr/item/SM_2007_198_8_a5/