The generalized Radon-Hurwitz numbers
Compositio Mathematica, Tome 59 (1986) no. 1, pp. 113-146.
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     title = {The generalized {Radon-Hurwitz} numbers},
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     publisher = {Martinus Nijhoff Publishers},
     volume = {59},
     number = {1},
     year = {1986},
     mrnumber = {850125},
     zbl = {0599.10014},
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     url = {http://www.numdam.org/item/CM_1986__59_1_113_0/}
}
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Berger, Marc A.; Friedland, Shmuel. The generalized Radon-Hurwitz numbers. Compositio Mathematica, Tome 59 (1986) no. 1, pp. 113-146. http://www.numdam.org/item/CM_1986__59_1_113_0/

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