He died in December 1989 in Oslo .
He was a member of the Norwegian Academy for Language and Literature from 1953 ( and secretary from 1969 to 1979 ) and of the Norwegian Academy of Science and Letters from 1965 .
member died in December 1989 in Oslo .
He was a member of the Norwegian Academy for Language and Literature from 1953 ( and secretary from 1969 to 1979 ) and of the Norwegian Academy of Science and Letters from 1965 .