On the differentiability of weak solutions of certain non-elliptic equations II
Volume 23 / 1963
                    
                    
                        Studia Mathematica 23 (1963), 85-103                    
                                        
                        DOI: 10.4064/sm-23-1-85-103                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            