On a class of elliptic differential operators degenerating at one point
Tom 10 / 1983
                    
                    
                        Banach Center Publications 10 (1983), 69-78                    
                                        
                        DOI: 10.4064/-10-1-69-78                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            