. . "David W. Robertson"@en . . . "David William Robertson" . . "Robertson, David W. (David Walter)" . . . "Robertson"@en . "David"@en . . "Robertson, David W. (David William)" . "William" . . "David W." . "David Wyatt Robertson" . "1937" . "W."@en . "Walter" . "Wyatt" . "David W. Robertson" . "David Walter Robertson" . .