On orderings of the system of subsets of ordered sets
Tom 70 / 1971
                    
                    
                        Fundamenta Mathematicae 70 (1971), 231-243                    
                                        
                        DOI: 10.4064/fm-70-3-231-243                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            