Geodesic
Constructibility of exceptional pairs of vector bundles on a quadric
Izvestiya. Mathematics , Tome 42 (1994) no. 1, pp. 163-171.

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A theorem is proved to the effect that each exceptional pair of vector bundles on a two-dimensional quadric can be supplemented to a coil of a helix. A condition is presented when this coil can be obtained from a given one by tightening transformations. 
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S. Yu. Ziuzina. Constructibility of exceptional pairs of vector bundles on a quadric. Izvestiya. Mathematics , Tome 42 (1994) no. 1, pp. 163-171. http://geodesic.mathdoc.fr/item/IM2_1994_42_1_a8/

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