Nordemann, D.J.R. 1998. Periodicities, tendencies and prevision based on dynamic spectral analysis of the Paraguay river level series in Ladário County (1900/1995). Pesquisa Agropecuaria Brasileira. 33, 13 (Dec. 1998), 1787–1790. DOI:https://doi.org/10.1590/S1678-3921.pab1998.v33.5060.