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Ganea, T. (1971). Some problems on numerical homotopy invariants. In: Hilton, P.J. (eds) Symposium on Algebraic Topology. Lecture Notes in Mathematics, vol 249. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0060892
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DOI: https://doi.org/10.1007/BFb0060892
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