Bibliography
N. Dunford andJ. Schwartz,Linear Operators, Part I, Interscience, New York, 1958. 1958.
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National Science Foundation Fellow.
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Hahn, F. A fixed-point theorem. Math. Systems Theory 1, 55–57 (1967). https://doi.org/10.1007/BF01692496
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DOI: https://doi.org/10.1007/BF01692496