On the greatest congruence relation contained in an equivalence relation and its applications to the algebraic theory of machines
Volume 29 / 1974
                    
                    
                        Colloquium Mathematicum 29 (1974), 31-43                    
                                        
                        DOI: 10.4064/cm-29-1-31-43                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            