Population dynamics of Cylindrospermopsis raciborskii (Woloszynska) Seenayya & Subba Raju, a Cyanobacteria toxic species, in water supply reservoirs in São Paulo, Brazil - Gemelgo, Marcina Cecilia Ponte; Sant'Anna, Célia L.; Tucci, Andréa; Barbosa, Heloiza Ramos (Hoehnea, 2008)