no. 2
Convolutions and factorization theorems
Compositio Mathematica, Tome 28 (1974) no. 2, pp. 143-157. 
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     author = {Chivukula, R. Rao and Heckman, Randall K.},
     title = {Convolutions and factorization theorems},
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     volume = {28},
     number = {2},
     year = {1974},
     mrnumber = {342957},
     zbl = {0284.43003},
     language = {en},
     url = {http://www.numdam.org/item/CM_1974__28_2_143_0/}
}
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Chivukula, R. Rao; Heckman, Randall K. Convolutions and factorization theorems. Compositio Mathematica, Tome 28 (1974) no. 2, pp. 143-157. http://www.numdam.org/item/CM_1974__28_2_143_0/

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