Published October 1970
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Published January 1979
Published January 1986
Published January 1989
Published January 1990
Published January 1991
Published January 1994
Published January 1995
Published January 1996
Published June 1996
Published November 1997
Published May 1998
Published July 1999
Published August 1999
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Published March 2000
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Published July 2000
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Published December 2000
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Published December 2003
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Published April 2004
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Published May 2005