Caristi's fixed point theorem and metric convexity
Tom 36 / 1976
                    
                    
                        Colloquium Mathematicum 36 (1976), 81-86                    
                                        
                        DOI: 10.4064/cm-36-1-81-86                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            