Zdzisław Opial---a mathematician 1930--1974
Tom 51 / 1990
                    
                    
                        Annales Polonici Mathematici 51 (1990), 7-13                    
                                        
                        DOI: 10.4064/ap-51-1-7-13                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            