Geodesic
The existence of a~straight line on Fano 3-folds
Izvestiya. Mathematics , Tome 15 (1980) no. 1, pp. 173-209.

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In this paper is shown the existence of a straight line on a Fano 3-fold of the principal series (under the anticanonical embedding) if the 3-fold has index 1 and is not isomorphic to the product $\mathbf P^1\times\mathbf P^2$. Bibliography: 13 titles. 
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V. V. Shokurov. The existence of a~straight line on Fano 3-folds. Izvestiya. Mathematics , Tome 15 (1980) no. 1, pp. 173-209. http://geodesic.mathdoc.fr/item/IM2_1980_15_1_a7/

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