Nonlinear Analysis: Theory, Methods & Applications
Nonlinear Analysis > 2009 > 71 > 5-6 > 1654-1661
Nonlinear Analysis > 2009 > 71 > 12 > e1247-e1254
Nonlinear Analysis > 2009 > 71 > 12 > e103-e108
Nonlinear Analysis > 2009 > 71 > 12 > e1448-e1460