Deformations of theta divisors and the rank 4 quadrics problem
Compositio Mathematica, Tome 76 (1990) no. 3, pp. 367-398. 
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     number = {3},
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     mrnumber = {1080008},
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Smith, Roy; Varley, Robert. Deformations of theta divisors and the rank $4$ quadrics problem. Compositio Mathematica, Tome 76 (1990) no. 3, pp. 367-398. http://www.numdam.org/item/CM_1990__76_3_367_0/

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