1981-2582 1981-2582 S1981-25822015000100021 10.15448/1981-2582.2015.1.20325 Colombia 00 04 2015 00 04 2015 38 1 21 31

69 203 203 335-42 12 12 229-51 3 3 47-53 21 2-3 2-3 155-67 49 203 203 323-31