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2. Almost all 1-set-contractions have a fixed point;Butler,1979
3. Punti uniti in transformazioni a codominio non compatto;Darbo,1955
4. Some generic properties in fixed point theory;De Blasi;J. Math. Anal. Appl.,1979
5. Generic properties for some classes of operator equations;De Blasi;J. London Math. Soc.,1981