Preface on "New trends of numerical and analytical methods"
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1.
Institute for Groundwater Studies, University of the Free State, Bloemfontein, 9300, South Africa
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2.
CONACyT-Tecnológico Nacional de México/CENIDET, Interior Internado Palmira S/N, Col. Palmira, C.P. 62490, Cuernavaca Morelos, México
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3.
Department of Chemical Engineering, University of Chemical Technology and Metallurgy, Sofia, Sofia 1756, 8 Kliment Ohridsky, blvd, Bulgaria
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4.
Institute for Groundwater Studies, Faculty of Natural and Agricultural Sciences University of the Free State, Bloemfontein 9300, South Africa
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5.
Department of Mathematical Sciences Federal University of Technology, PMB 704, Akure Ondo State, Nigeria