scientific article (publication date: February 1966)

scientific article published in April 1969

scientific article published in January 1979

scientific article published in January 1977

scientific article published in January 1967

scientific article published in January 1977

scientific article published in January 1965

scientific article

scientific article published in 1967

scientific article published in January 1977

scientific article published in January 1977

scientific article published in January 1981

scientific article (publication date: June 1969)

scientific article published in 1972

scientific article published in 1954

scientific article published in January 1976

scientific article published in 1962

scientific article published in 1963

scientific article published in January 1979

scientific article published in 1976

scientific article published in January 1966

scientific article published in 1964

scientific article published in 1964

scientific article published in 1963

scientific article published in 1983

scientific article published in January 1976

scientific article published in January 1982

scientific article published in January 1980

scientific article published in January 1977