TY - JOUR T1 - Treatment of geophysical data as a non-stationary process JO - Computational & Applied Mathematics A1 - Rocha, Marcus P.C. A1 - Leite, Lourenildo W.B. SN - 1807-0302 UL - 10.1590/S0101-82052003000200001 VL - 22 Y1 - 2003 PB - Brasil ER -