scientific article published in June 1971

scientific article published on 5 June 1968

scientific article

scientific article (publication date: 31 July 1981)

scientific article published on 31 July 1981

scientific article published in September 1974

scientific article published in March 1976

scientific article published on 10 May 2006

scientific article published in March 1977

scientific article published in 1970

scientific article published in 1978

scientific article published in 1977

scientific article

scientific article published on 15 March 1968

scientific article published in March 1975

scientific article

scientific article published on 18 May 1979

scientific article published on 12 March 1976

scientific article published on 17 May 1976

scientific article published on 10 February 1978

scientific article published on 10 May 2006

scientific article published on 25 November 1977

scientific article published in 1970

scientific article published in 1968

scientific article published in 1977

scientific article published in 1976

scientific article published in 1977

scientific article

scientific article published in March 1971

scientific article published in September 1968

article

scientific article published in February 1980

scientific article published in 1968

scientific article published in 1978

scientific article published in June 1967

scientific article published in December 1966

scientific article published in 1979