Extremal contractions from 4-dimensional manifolds to 3-folds
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 24 (1997) no. 1, pp. 63-131.
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     title = {Extremal contractions from $4$-dimensional manifolds to $3$-folds},
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Kachi, Yasuyuki. Extremal contractions from $4$-dimensional manifolds to $3$-folds. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 24 (1997) no. 1, pp. 63-131. http://archive.numdam.org/item/ASNSP_1997_4_24_1_63_0/

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