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Aequationes mathematicae > 2015 > 89 > 4 > 1195-1205
Optimization Letters > 2013 > 7 > 8 > 1701-1710
Annales Polonici Mathematici > 2000 > 73 > 1 > 29-36
Science in China (Scientia Sinica) Series A > 1995 > 38 > 3 Series A > 267-272