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Research supported by the Netherlands Organisation for the Advancement of Pure Research (Z.W.O.); this text is submitted as a Ph. D. thesis in Amsterdam.
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Takens, F. The minimal number of critical points of a function on a compact manifold and the Lusternik-Schnirelman category. Invent Math 6, 197–244 (1968). https://doi.org/10.1007/BF01404825
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DOI: https://doi.org/10.1007/BF01404825