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References:
[1] Hilton P. J.: An introduction to homotopy theory. Cambridge University Press, 1964. MR 0056289
[2] Nikaido H.: Convex structures and economic theory. Academic Press, New York 1968. MR 0277233 | Zbl 0172.44502
[3] Polák V.: Mathematical politology. University of JEP, Brno, University Press, 3nd edit. 1969. MR 0253764
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