. "1904-12-20Z"^^ . "1994Z"^^ . . "1904Z"^^ . . . . . . "Hans Gustav Burkhardt (December 20, 1904 \u2013 April 22, 1994) was a Swiss American abstract expressionist."@en . "Burkhardt, Hans Gustav"@en . "Hans Gustav Burkhardt"@en . . "1994-04-22Z"^^ . "Hans Burkhardt"@en . . . "American artist" . .