Fudenberg, Drew, and David K.Levine, Eric Maskin(1994), “The Folk Theorem with Imperfect Public Information”, Econometrica, Vol. 62, No. 5, pp. 997–1039.
Fudenberg, Drew, and Eric Maskin(1986), “The Folk Theorem in Repeated Games with Discounting or with Incomplete Information”, Econometrica, Vol. 54, No. 3, pp. 533–554.
Kreps, David M., and Paul Milgrom, John Roberts and Robert Wilson(1982), “Rational Cooperation in the Finitely Repeated Prisoner's Dilemma”, Journal of Economic Theory, Vol. 27, No. 7. pp. 245–252.
Nishihara, Ko(2008), “Expected Number of Cooperators in the N-person Prisoner's Dlemma wtih Random Order Move”, Japanese Economic Review, Vol. 59, Issue 2, pp. 241-257, June 2008.