@article{CM_1980__41_1_61_0,
     author = {Roberts, Joel},
     title = {Some properties of double point schemes},
     journal = {Compositio Mathematica},
     pages = {61--94},
     publisher = {Sijthoff et Noordhoff International Publishers},
     volume = {41},
     number = {1},
     year = {1980},
     mrnumber = {578051},
     zbl = {0462.14021},
     language = {en},
     url = {http://www.numdam.org/item/CM_1980__41_1_61_0/}
}