Characterizations of Learnability for Classes of {0, ..., n}-Valued Functions.

Shai Ben-David Nicolò Cesa-Bianchi David Haussler Philip M. Long Characterizations of Learnability for Classes of {0, ..., n}-Valued Functions. 74-86 1995 50 J. Comput. Syst. Sci. 1 db/journals/jcss/jcss50.html#Ben-DavidCHL95