Comparative study between four classical spectral analysis methods. - Nivaor Rodolfo Rigozo; Ezequiel Echer; Daniel Jean Roger Nordemann; Luís Eduardo Antunes Vieira; Heloisa Helena de Faria (Appl. Math. Comput., 2005)

Principal components and iterative regression analysis of geophysical series: Application to Sunspot number (1750-2004). - Daniel Jean Roger Nordemann; Nivaor Rodolfo Rigozo; M. P. de Souza Echer; Ezequiel Echer (Comput. Geosci., 2008)