Some additive properties of sets of real numbers
Tom 113 / 1981
                    
                    
                        Fundamenta Mathematicae 113 (1981), 187-199                    
                                        
                        DOI: 10.4064/fm-113-3-187-199                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            