scientific article published in March 1995

scientific article published in June 1987

scientific article published in May 1989

scientific article published in May 2005

scientific article published in April 1993

scientific article published in August 1990

scientific article published in December 1982

scientific article published in August 1981

scientific article published in September 1989

scientific article published in July 1982

scientific article published in June 1989

scientific article published in October 1991

scientific article published in September 1981

scientific article published in March 1990

scientific article published in December 1986

scientific article published in May 1984

scholarly article published December 1991

scientific article published in June 1983

scientific article published in April 1986

scientific article published in July 1989

scientific article published in March 1990

scientific article published in March 1988

scientific article published in January 1985

scientific article published in September 1987

scientific article published in October 2000

scientific article published in March 1995

scientific article published in July 1992

scientific article published in July 1981

scientific article published in May 1987

scientific article published in October 2003

scientific article published in January 1998

scientific article published in September 1984

scientific article published in June 1986

scientific article published in October 2002

scientific article published in September 1985

scholarly article published September 2002

scientific article published in March 1995

scientific article published in September 1985