scientific article published in November 1994

scientific article published in December 2008

scientific article published in August 1990

scientific article published in February 2014

scientific article published in July 1989

scientific article published in February 1995

scientific article published in December 1989

scientific article published in September 1991

scientific article published in December 1995

scientific article published in March 1983

scientific article published in May 1989

scientific article published in September 1991

scientific article published in October 1985

scientific article published in October 1985

scientific article published in March 2006

scientific article published in April 1982

scientific article published in April 1996

scientific article published in July 2007

scientific article published in September 1997