no. 2
Effective divisors of higher rank on a curve and the Siegel formula
Compositio Mathematica, Tome 83 (1992) no. 2, pp. 147-159. 
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     title = {Effective divisors of higher rank on a curve and the {Siegel} formula},
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     volume = {83},
     number = {2},
     year = {1992},
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     url = {http://archive.numdam.org/item/CM_1992__83_2_147_0/}
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Ghione, F.; Letizia, M. Effective divisors of higher rank on a curve and the Siegel formula. Compositio Mathematica, Tome 83 (1992) no. 2, pp. 147-159. http://archive.numdam.org/item/CM_1992__83_2_147_0/

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