0065-1737 0065-1737 S0065-17372018000100205 10.21829/azm.2018.3411190 Guatemala Guatemala 00 00 2018 00 00 2018 34

2014 2006 66 3 3 995-56 1989 343 1-5 1976 1 313-30 2010 17 2 2 353-60