On α-homomorphic images of α-rings of sets
Volume 51 / 1962
                    
                    
                        Fundamenta Mathematicae 51 (1962), 259-266                    
                                        
                        DOI: 10.4064/fm-51-3-259-266                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            