Some properties of double point schemes
Compositio Mathematica, Tome 41 (1980) no. 1, pp. 61-94. 
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     author = {Roberts, Joel},
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     pages = {61--94},
     publisher = {Sijthoff et Noordhoff International Publishers},
     volume = {41},
     number = {1},
     year = {1980},
     mrnumber = {578051},
     zbl = {0462.14021},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1980__41_1_61_0/}
}
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Roberts, Joel. Some properties of double point schemes. Compositio Mathematica, Tome 41 (1980) no. 1, pp. 61-94. http://archive.numdam.org/item/CM_1980__41_1_61_0/

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