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Zhou, Q. Second-order optimality principle for singular optimal control problems. (English) Zbl 0843.49013 J. Optimization Theory Appl. 88, No. 1, 247-249 (1996). MSC: 49K15 PDFBibTeX XMLCite \textit{Q. Zhou}, J. Optim. Theory Appl. 88, No. 1, 247--249 (1996; Zbl 0843.49013) Full Text: DOI