scientific article published on 01 January 1980

scientific article published on 01 December 1981

article

scientific article

scientific article

scientific article published in October 1984

scientific article published on 01 October 1994

scientific article published on 01 September 1990

scientific article published on 01 August 1977

scientific article published on January 1977

scientific article published in September 1976

scientific article published on 01 October 1968

scientific article published on 01 October 1991

scientific article published in November 1989

scientific article published on July 1991

scientific article published in November 1974

scientific article published on 01 August 1985

scientific article published in August 1969

scientific article