[1] Univ Pau, CNRS UMR 5142, Lab Math & Leurs Applicat, Av Univ, F-64000 Pau, France
[2] Prirodoslovno Matemat Fak, Bijenicka Cesta 30, Zagreb 10000, Croatia
[3] Moscow Inst Phys & Technol, Lab Fluid Dynam & Seism, 9 Inst Skiy, Dolgoprudnyi 141700, Moscow Region, Russia
[4] Rudarsko Geolosko Naftni Fak, Pierottijeva 6, Zagreb 10000, Croatia