Adding Wildcards to the Java Programming Language. - Mads Torgersen; Erik Ernst; Christian Plesner Hansen; Peter von der Ahé; Gilad Bracha; Neal M. Gafter (J. Object Technol., 2004)

Modules as Objects in Newspeak. - Gilad Bracha; Peter von der Ahé; Vassili Bykov; Yaron Kashai; William Maddox; Eliot Miranda (ECOOP, 2010)