scientific article published in July 2003

scientific article published in November 1989

scientific article published in February 1999

scientific article published in November 1987

scientific article published in December 2003

scientific article published in October 1993

scientific article published in October 2007

scientific article published in May 1989

scholarly article published March 1987

scientific article published in July 1996

scientific article published in May 1996

scientific article published in May 1996

scientific article published in November 1998

scientific article published in October 2002

scientific article published in January 2008

scientific article published in February 2012

scientific article published in July 2007

scientific article published in January 2013

scientific article published in July 1986

scientific article published in May 2014

scientific article published in February 2001

scientific article published in September 1991

scientific article published in October 2017