no. 3
Joins of schemes, linear projections
Compositio Mathematica, Tome 31 (1975) no. 3, pp. 309-343 
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     author = {Altman, Allen B. and Kleiman, Steven L.},
     title = {Joins of schemes, linear projections},
     journal = {Compositio Mathematica},
     pages = {309--343},
     year = {1975},
     publisher = {Noordhoff International Publishing},
     volume = {31},
     number = {3},
     mrnumber = {396560},
     zbl = {0337.14004},
     language = {en},
     url = {https://www.numdam.org/item/CM_1975__31_3_309_0/}
}
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Altman, Allen B.; Kleiman, Steven L. Joins of schemes, linear projections. Compositio Mathematica, Tome 31 (1975) no. 3, pp. 309-343. https://www.numdam.org/item/CM_1975__31_3_309_0/

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