2238-121X 2238-121X S2238-121X2014000200017 10.15600/2238-121X/comunicacoes.v21n2p17-32 Brazil Brazil Brazil 00 12 2014 00 12 2014 21 2 17 32

91 228 228 315-44 38 2 2 373-88 19 39 39 2 1 1 57-61 10 2 2