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Afrika Matematika > 2017 > 28 > 1-2 > 237-247
Science China Mathematics > 2017 > 60 > 1 > 133-146
Nonlinear Analysis: Theory, Methods & Applications > 2016 > 132 > C > 95-114
Afrika Matematika > 2017 > 28 > 1-2 > 237-247
Science China Mathematics > 2017 > 60 > 1 > 133-146
Nonlinear Analysis: Theory, Methods & Applications > 2016 > 132 > C > 95-114