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Journal of Optimization Theory and Applications > 2017 > 175 > 1 > 39-58
Journal de mathematiques pures et appliquees > 2013 > 99 > 4 > 419-435
Applied Mathematics Letters > 2008 > 21 > 8 > 814-819
Applied Mathematics Letters > 2004 > 17 > 10 > 1127-1133
Cybernetics and Systems Analysis > 2002 > 38 > 3 > 313-322