Abstract Grothendieck rings
Tom 53 / 1987
                    
                    
                        Colloquium Mathematicum 53 (1987), 17-25                    
                                        
                        DOI: 10.4064/cm-53-1-17-25                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            