Models of second order arithmetic with definable Skolem functions
Tom 75 / 1972
                    
                    
                        Fundamenta Mathematicae 75 (1972), 223-234                    
                                        
                        DOI: 10.4064/fm-75-3-223-234                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            