The theorem of Hildebrandt
Volume 7 / 1938
                    
                    
                        Studia Mathematica 7 (1938), 157-158                    
                                        
                        DOI: 10.4064/sm-7-1-157-158                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            