 
                            
                        
                        
                        and Eric Maskin. " The folk theorem in repeated games with discounting or with incomplete information http://www.eecs.harvard.edu/~parkes/cs286r/spring06/papers/fudmaskin_folk86.pdf." Econometrica: Journal of the Econometric Society (1986): p. 533; Lead paragraph.
 
        
     
                             
                             
                             
                             
                            