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