Mordukhovich, B. Sh. Penalty functions and necessary conditions for an extremum in non-smooth and non-convex optimization. (English) Zbl 0487.49017 Russ. Math. Surv. 36, No. 1, 242-243 (1981). MSC: 49M37 49K10 26B05 49J45 93B05 34A60 PDFBibTeX XMLCite \textit{B. Sh. Mordukhovich}, Russ. Math. Surv. 36, No. 1, 242--243 (1981; Zbl 0487.49017) Full Text: DOI
Tagiev, M. G. A necessary and sufficient condition for a strong extremum in a degenerate problem of the calculus of variations. (English. Russian original) Zbl 0474.49022 Russ. Math. Surv. 34, No. 4, 187-188 (1979); translation from Usp. Mat. Nauk 34, No. 4(208), 211-212 (1979). MSC: 49K10 49J10 PDFBibTeX XMLCite \textit{M. G. Tagiev}, Russ. Math. Surv. 34, No. 4, 187--188 (1979; Zbl 0474.49022); translation from Usp. Mat. Nauk 34, No. 4(208), 211--212 (1979) Full Text: DOI