Search results
Journal of Geometry and Physics > 2014 > 85 > Complete > 40-45
Communications in Nonlinear Science and Numerical Simulation > 2014 > 19 > 3 > 448-458
Applied Mathematics Letters > 2000 > 13 > 6 > 45-48
Journal of Mathematical Analysis and Applications > 1998 > 217 > 1 > 161-178