Sá, L.D. de A., Sambatti, S.B.M. and Galvão, G.P. (1998) “Applying the Morlet wavelet in a study of variability of the level of Paraguay river at Ladário, MS”, Pesquisa Agropecuaria Brasileira, 33(13), pp. 1775–1785. doi:10.1590/S1678-3921.pab1998.v33.5061.