2414-8938 2414-8938 S2414-89382017000200045 10.30545/academo.2017.jul-dic.7 Paraguay 00 12 2017 00 12 2017 4 2 45 54

2000 57 2 2 475-99 2011 73-84 2012 1991 12 183-203 1998 25 25 151-84 1999 25 139-65 2000 1997 23 11-21 2009 40 81-120 1952