1990-8644 1990-8644 S1990-86442019000300249 Cuba 00 09 2019 00 09 2019 15 68 249 258

2001 2016 4 1 1 67-82 2012 625-34 1973 211-39 1996 New York 2001 2004 2001 19 3 3 405-14 1998 234-83 2015 2000 2010 National Council of Teachers of Mathematics 2003 2014 1966 2004 113-20 1985 1978