Geodesic
On~the~Torelli and Schottky problems for Prym varietes
Izvestiya. Mathematics , Tome 45 (1995) no. 2, pp. 297-314.

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It is shown that the loci of tetragonal curves and Prymians yield irreducible components of the noninjectivity loci of the Prym map and theta map, respectively. 
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D. Yu. Radionov. On~the~Torelli and Schottky problems for Prym varietes. Izvestiya. Mathematics , Tome 45 (1995) no. 2, pp. 297-314. http://geodesic.mathdoc.fr/item/IM2_1995_45_2_a3/

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