Shai Ben-DavidNicolò Cesa-BianchiPhilip M. LongCharacterizations of Learnability for Classes of {O, ..., n}-Valued Functions.333-3401992conf/colt/1992COLThttps://doi.org/10.1145/130385.130423https://www.wikidata.org/entity/Q56214753db/conf/colt/colt1992.html#Ben-DavidCL92