. . . . . . . . "A COMPUTER METHOD OF FITTING SURFACES TO ASSAY AND OTHER DATA IN THREE DIMENSIONS BY QUADRATIC-REGRESSION ANALYSIS" . . . . . "A computer method of fitting surfaces to assay and other data in three dimensions by quadratic-regression analysis" . "A computer method of fitting surfaces to assay and other data in three dimensions by quadratic-regression analysis"@en . . . . . . . . . . .