Metric characterizations of Banach and Euclidean spaces
Tom 55 / 1964
                    
                    
                        Fundamenta Mathematicae 55 (1964), 23-55                    
                                        
                        DOI: 10.4064/fm-55-1-23-55                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            