0188-6649 0188-6649 S0188-66492007000100139 10.21555/top.v32i1.174 USA 00 00 2007 00 00 2007 32 139 159

1987 1988 1990 1994 1996 2000 2002 51 2006 2003 1997 2005 1994 1999