Addition of phosphate and ammonia and their effects on primary productivity by phytoplankton of lake dom helvecio in experiments using large enclosures - Henry, R; Tundisi, José Galizia; Calijuri, Maria do Carmo; Rodrigues de Ibañez, M S; Mitamura, O; Matsumura-Tundisi, T; Rocha, O; Espíndola, Evaldo Luiz Gaeta; Guillen, S M (Limnological Studies on the Rio Doce Valley Lakes, Brazil, 1997)