2238-121X 2238-121X S2238-121X2014000200083 10.15600/2238-121X/comunicacoes.v21n2p83-95 Brazil Brazil 00 12 2014 00 12 2014 21 2 83 95

26 2 2 1 5 20 20 18-123 10 2 2 227-34