A simplex design for gradient estimation in quadratic regression
Tom 13 / 1973
                    
                    
                        Applicationes Mathematicae 13 (1973), 493-496                    
                                        
                        DOI: 10.4064/am-13-4-493-496                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            