A generalization of a theorem of Skala
Volume 112 / 1981
                    
                    
                        Fundamenta Mathematicae 112 (1981), 121-123                    
                                        
                        DOI: 10.4064/fm-112-2-121-123                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            