Combinatorial group theory, discrete groups, and number theory a conference in honor of Gerhard Rosenberger, December 8-9, 2004, Fairfield University : AMS Special Session on Infinite Groups, October 8-9, 2005, Bard College / - Rosenberger, Gerhard.; Fine, Benjamin,; Gaglione, Anthony M.; Spellman, Dennis, (American Mathematical Society,)