Nonlinear Analysis: Theory, Methods & Applications
Nonlinear Analysis > 2009 > 71 > 7-8 > 2708-2715
Nonlinear Analysis > 2009 > 71 > 9 > 4203-4214
Nonlinear Analysis > 2009 > 71 > 10 > 4448-4460
Nonlinear Analysis > 2009 > 71 > 10 > 4852-4861