1405-9193 1405-9193 S1405-91932018000200089 10.22201/iij.24484881e.2018.39.12650 Bolivia 00 12 2018 00 12 2018 39 89 106

1984 2010 2010 1962 16 2007 4 4 20 1995 6 77-999 2006 5 5 17 2002 1970 2003 143 23 23 58 2007 8 8 2003 1 1 2011 2014 64