Smith, H. L.Stuart, Charles Alexander2008-12-102008-12-102008-12-10198010.1090/S0002-9939-1980-0565346-2https://infoscience.epfl.ch/handle/20.500.14299/32385WOS:A1980JT92300018K-set-contractionuniquenessA uniqueness theorem for fixed pointstext::journal::journal article::research article