Nonlinear Analysis: Theory, Methods & Applications
Nonlinear Analysis > 2009 > 71 > 12 > e1659-e1672
Nonlinear Analysis > 2009 > 71 > 12 > e1420-e1425
Nonlinear Analysis > 2009 > 71 > 12 > e1659-e1672
Nonlinear Analysis > 2009 > 71 > 12 > e1420-e1425