On the disc theorem
Volume 55 / 1991
                    
                    
                        Annales Polonici Mathematici 55 (1991), 1-10                    
                                        
                        DOI: 10.4064/ap-55-1-1-10                    
                                    
                                                Abstract
Ahlfors' disc theorem for Riemann covering surfaces is extended to normally exhaustible Klein coverings.
 
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            