On continuous solutions of some functional equations of the n-th order
Tom 11 / 1961
                    
                    
                        Annales Polonici Mathematici 11 (1961), 123-132                    
                                        
                        DOI: 10.4064/ap-11-2-123-132                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            