Associative and idempotent algebras are at most ternary
Tom 36 / 1976
                    
                    
                        Colloquium Mathematicum 36 (1976), 177-180                    
                                        
                        DOI: 10.4064/cm-36-2-177-180                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            