On shape preserving spline interpolation: existence theorems and determination of optimal splines
Volume 22 / 1989
                    
                    
                        Banach Center Publications 22 (1989), 377-389                    
                                        
                        DOI: 10.4064/-22-1-377-389                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            