no. 3
Joins of schemes, linear projections
Compositio Mathematica, Tome 31 (1975) no. 3, pp. 309-343. 
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     title = {Joins of schemes, linear projections},
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     volume = {31},
     number = {3},
     year = {1975},
     mrnumber = {396560},
     zbl = {0337.14004},
     language = {en},
     url = {http://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. http://www.numdam.org/item/CM_1975__31_3_309_0/

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