1981-0431 1981-0431 S1981-04312014000300643 10.5965/15164896v20n432014643 Brazil 00 09 2014 00 09 2014 20 43 643 663

17 1 1 73-81 27 96 96 797-818 115 115 25-63 40 141 141 693-728 28 100 100 1231-255