@article{CM_1975__31_3_309_0,
     author = {Altman, Allen B. and Kleiman, Steven L.},
     title = {Joins of schemes, linear projections},
     journal = {Compositio Mathematica},
     pages = {309--343},
     publisher = {Noordhoff International Publishing},
     volume = {31},
     number = {3},
     year = {1975},
     mrnumber = {396560},
     zbl = {0337.14004},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1975__31_3_309_0/}
}