2238-121X 2238-121X S2238-121X2014000200067 10.15600/2238-121X/comunicacoes.v21n2p67-81 Brazil Brazil Brazil 00 12 2014 00 12 2014 21 2 67 81

8 12 12 81-95 9 2 2 291-300 33 1 1 4-10 32 2 2 397-410 14 2 2 17 1 1 27 2 2