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Nonlinear Analysis > 2004 > 58 > 7-8 > 885-898
Nonlinear Analysis: Real World Applications > 2004 > 5 > 1 > 33-44
Nonlinear Analysis > 2004 > 56 > 1 > 133-146
Differential Geometry and its Applications > 2003 > 18 > 3 > 285-293
Journal of Computational and Applied Mathematics > 2002 > 143 > 1 > 69-80