no. 3
On 3-folds in ℙ 5 which are scrolls
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 19 (1992) no. 3, pp. 451-471. 
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     title = {On 3-folds in $\mathbb {P}^5$ which are scrolls},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
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     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 19},
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Ottaviani, Giorgio. On 3-folds in $\mathbb {P}^5$ which are scrolls. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 19 (1992) no. 3, pp. 451-471. http://archive.numdam.org/item/ASNSP_1992_4_19_3_451_0/

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