scientific article published in January 1997

scientific article published in April 2009

scholarly article

scholarly article published in 2009

scientific article published in March 2001

scientific article published in March 2006

scientific article published in June 2000

scholarly article published in 2005

scientific article published in June 1998

scholarly article published in 2018

scientific article published in July 2004

scientific article published in April 2009

scientific article published in October 2007

scholarly article

scholarly article

scholarly article published in 2004

scientific article published in September 2000

scholarly article published in 2000