On the convergence of iterates
Volume 20 / 1968
                    
                    
                        Annales Polonici Mathematici 20 (1968), 195-198                    
                                        
                        DOI: 10.4064/ap-20-2-195-198                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            