2238-121X 2238-121X S2238-121X2014000200041 10.15600/2238-121X/comunicacoes.v21n2p41-52 Brazil Brazil 00 12 2014 00 12 2014 21 2 41 52

25 89 89 1159-180 25 89 89 1203-225 25 89 89 1127-144 25 66 66 505-18