Avramov, S.; Nedyalkov, I.; Petrova, P. On an optimization problem of minimum drag airfoil. (Bulgarian) Zbl 0475.76021 God. Vissh. Uchebn. Zaved., Tekh. Fiz. 16(1979), No. 2, 149-160 (1980). MSC: 76B10 76D10 PDFBibTeX XMLCite \textit{S. Avramov} et al., God. Vissh. Uchebn. Zaved., Tekh. Fiz. 16, No. 2, 149--160 (1980; Zbl 0475.76021)
Ivanov, S.; Nedyalkov, I.; Panov, L.; Petrova, P. On a method for solving optimization problems in the theory of airfoil. (Bulgarian) Zbl 0475.76020 God. Vissh. Uchebn. Zaved., Tekh. Fiz. 16(1979), No. 2, 115-126 (1980). MSC: 76B10 76D10 65Z05 PDFBibTeX XMLCite \textit{S. Ivanov} et al., God. Vissh. Uchebn. Zaved., Tekh. Fiz. 16, No. 2, 115--126 (1980; Zbl 0475.76020)