Nonlinear Kelvin-Helmholtz instability of Rivlin-Ericksen viscoelastic electrified fluid-particle mixtures saturating porous mediaM. F. El-Sayed, N. T. Eldabe, M. H. Haroun and D. M. MostafaEur. Phys. J. Plus, 127 3 (2012) 29DOI: https://doi.org/10.1140/epjp/i2012-12029-7