1993
1990
1988
1988
1986
1983
1983
1980
1971
1971
1971
1971
1968
1968
1967
1967
1966
1962
Selected artcles, interviews and quotations
1993
1990
1988
1988
1986
1983
1983
1980
1971
1971
1971
1971
1968
1968
1967
1967
1966
1962