scientific article published in June 2003

scientific article published in April 2003

scientific article published in May 1987

scientific article published in August 1991

scientific article published in May 1995

scientific article published in February 2001

scientific article published in December 2003

scientific article published in January 2002

scientific article published in June 2003

scientific article published in December 1981

scientific article published in June 1981

scientific article published in February 1998

scientific article published in August 1980

scientific article published in April 1981

scientific article published in August 1996

scientific article published in November 1987

article published in 1980

scientific article published in May 1987

scientific article published in July 1986

scientific article published in July 2004

scientific article published in October 1993

scientific article published in November 1995

scientific article published in December 1997

scientific article published in August 1988

scientific article published in January 1983

scientific article published in October 1985

scientific article published in March 1984

scientific article published in August 1986

scientific article published in January 1980

scientific article published in November 1984

scientific article published in June 1983

scientific article published in April 1997

scientific article published in July 1985

scientific article published in October 1981

scientific article published in July 1982

scientific article published in April 1981

scientific article published in April 1986

scientific article published in May 1985

scientific article published in October 1982

scientific article published in August 1993

scientific article published in February 2005