A Torelli theorem for osculating cones to the theta divisor
Compositio Mathematica, Tome 67 (1988) no. 3, pp. 343-353. 
@article{CM_1988__67_3_343_0,
     author = {Kempf, George R. and Schreyer, Frank-Olaf},
     title = {A {Torelli} theorem for osculating cones to the theta divisor},
     journal = {Compositio Mathematica},
     pages = {343--353},
     publisher = {Kluwer Academic Publishers},
     volume = {67},
     number = {3},
     year = {1988},
     mrnumber = {959216},
     zbl = {0665.14018},
     language = {en},
     url = {http://www.numdam.org/item/CM_1988__67_3_343_0/}
}
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Kempf, George R.; Schreyer, Frank-Olaf. A Torelli theorem for osculating cones to the theta divisor. Compositio Mathematica, Tome 67 (1988) no. 3, pp. 343-353. http://www.numdam.org/item/CM_1988__67_3_343_0/

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[K3] G.R. Kempf: The equation defining a curve of genus 4, Proceedings of the AMS 97 (1986) 214-225. | MR | Zbl

[M] D. Mumford: Prym varieties I. In: (L.V. Ahlfors, I. Kra, B. Maskit and L. Nirenberg (eds) Contribution to Analysis. Academic Press, New York (1974) pp. 325-350. | MR | Zbl