Two examples of an alternative approach to systems analogous to the heat polynomials
Volume 19 / 1987
                    
                    
                        Banach Center Publications 19 (1987), 363-369                    
                                        
                        DOI: 10.4064/-19-1-363-369                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            