The Marine mussel Perna perna (molusca, bivalvia, mytilidae) as an indicator of contamination by heavy metals in the Ubatuba bay, São Paulo, Brazil - Avelar, Wagner Eustáquio Paiva; Mantelatto, Fernando Luiz Medina; Tomazelli, Andréa Cristina; Silva, Daniela M L da; Shuhama, Tadao; Lopes, João Luis Callegari (Water, Air and Soil Pollution, 2000)