The divisor of curves with a vanishing theta-null
Compositio Mathematica, Tome 66 (1988) no. 1, pp. 15-22. 
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     author = {Teixidor i Bigas, Montserrat},
     title = {The divisor of curves with a vanishing theta-null},
     journal = {Compositio Mathematica},
     pages = {15--22},
     publisher = {Kluwer Academic Publishers},
     volume = {66},
     number = {1},
     year = {1988},
     mrnumber = {937985},
     zbl = {0663.14017},
     language = {en},
     url = {http://www.numdam.org/item/CM_1988__66_1_15_0/}
}
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Teixidor i Bigas, Montserrat. The divisor of curves with a vanishing theta-null. Compositio Mathematica, Tome 66 (1988) no. 1, pp. 15-22. http://www.numdam.org/item/CM_1988__66_1_15_0/

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