A theorem of Cesari on mulitple Fourier series
Volume 49 / 1973
                    
                    
                        Studia Mathematica 49 (1973), 69-80                    
                                        
                        DOI: 10.4064/sm-49-1-69-80                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            