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They are defined as the maps $X\\to Y$ that induce the homomorphisms $\\mathcal{E}(X)\\to \\mathcal{E}( Y)$ and $\\mathcal{E}(Y)\\to \\mathcal{E}(X)$, respectively. We give some rationalized examples related to spheres, Lie groups and homogeneous spaces by using Sullivan models. 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