2222-145X 2222-145X S2222-145X2019000200101 10.18004/rcfacen.2019.10.2.101 Paraguay 00 12 2019 00 12 2019 10 2 101 111

2012 1 Ed 975 2005 750 2006 10 1990 18 21-27. 2000 767 2003 1 688 2003 2 97 2005 16 4 4 266-272. 2001 2 346 2007 1 725