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Topology and its Applications > 2005 > 152 > 1-2 > 70-82
Journal of Mathematical Analysis and Applications > 2002 > 271 > 1 > 257-266
Journal of Differential Equations > 2000 > 161 > 2 > 245-288
Annales Polonici Mathematici > 2000 > 73 > 2 > 159-168