Grigyalenis, A. On the “uniform ball condition” and necessary conditions of optimality in problems with free boundaries. (Russian. English summary) Zbl 0625.49009 Differ. Uravn. Primen. 40, 16-22 (1987). MSC: 49K20 35R35 PDFBibTeX XMLCite \textit{A. Grigyalenis}, Differ. Uravn. Primen. 40, 16--22 (1987; Zbl 0625.49009)
Grigyaleis, A. On the conditional extremum in problems with free boundary. (Russian. English summary) Zbl 0621.49001 Differ. Uravn. Primen. 38, 15-22 (1986). MSC: 49J20 35R35 93C20 PDFBibTeX XMLCite \textit{A. Grigyaleis}, Differ. Uravn. Primen. 38, 15--22 (1986; Zbl 0621.49001)
Chyupajla, R. On the solution of the problem of calculation of drop dynamics by the finite element method. (Russian. English summary) Zbl 0636.76114 Differ. Uravn. Primen. 37, 82-95 (1985). MSC: 76T99 49S05 PDFBibTeX XMLCite \textit{R. Chyupajla}, Differ. Uravn. Primen. 37, 82--95 (1985; Zbl 0636.76114)
Kibenko, Anatolij; Gusar, Viktor On the problem of optimal stabilization for nonlinear systems. (Russian. English summary) Zbl 0573.49001 Differ. Uravn. Primen. 32, 46-56 (1982). MSC: 49J15 93C10 93D15 49M99 93C15 PDFBibTeX XMLCite \textit{A. Kibenko} and \textit{V. Gusar}, Differ. Uravn. Primen. 32, 46--56 (1982; Zbl 0573.49001)