A remark on Fox's paper on shape
Tom 75 / 1972
                    
                    
                        Fundamenta Mathematicae 75 (1972), 205-208                    
                                        
                        DOI: 10.4064/fm-75-3-205-208                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            