no. 4
On del Pezzo fibrations
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 28 (1999) no. 4, pp. 615-639. 
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Mella, Massimiliano. On del Pezzo fibrations. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 28 (1999) no. 4, pp. 615-639. http://www.numdam.org/item/ASNSP_1999_4_28_4_615_0/

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