Konstantinov, M. M.; Velev, V. A. Globally bounded and almost periodic solutions of a system of differential equations unsolved with respect to the derivative. (Bulgarian) Zbl 0435.34031 God. Vissh. Uchebn. Zaved., Prilozhna Mat. 13(1977), No. 4, 93-100 (1978). MSC: 34C25 34C11 34A34 PDFBibTeX XMLCite \textit{M. M. Konstantinov} and \textit{V. A. Velev}, God. Vissh. Uchebn. Zaved., Prilozh. Mat. 13, No. 4, 93--100 (1978; Zbl 0435.34031)
Konstantinov, M. M.; Velev, V. A. On a boundary value problem for an infinite-dimensional system of differential equations with deviating argument. (Bulgarian) Zbl 0419.34064 God. Vissh. Uchebn. Zaved., Prilozhna Mat. 12(1976), No. 4, 183-189 (1977). MSC: 34K10 PDFBibTeX XMLCite \textit{M. M. Konstantinov} and \textit{V. A. Velev}, God. Vissh. Uchebn. Zaved., Prilozh. Mat. 12, No. 4, 183--189 (1977; Zbl 0419.34064)
Konstantinov, M. M.; Velev, V. A. Quasistationary regime in one-channel continuous system for automatic optimization with synchronous detector. (English) Zbl 0303.93036 Avtom. Izchisl. Tekh. 1974, No. 5, 24-28 (1974). MSC: 93C15 93D99 PDFBibTeX XMLCite \textit{M. M. Konstantinov} and \textit{V. A. Velev}, Avtom. Izchislitelna Tekh. 1974, No. 5, 24--28 (1974; Zbl 0303.93036)
Konstantinov, M. M.; Velev, V. A. On the least squares method for solving one generalized boundary value problem. (Russian) Zbl 0305.34043 Bul. Inst. Politeh. Iași, Secț. I 18(22), No. 3-4, 81-85 (1972). MSC: 34L99 PDFBibTeX XMLCite \textit{M. M. Konstantinov} and \textit{V. A. Velev}, Bul. Inst. Politeh. Iași, Secț. I 18(22), No. 3--4, 81--85 (1972; Zbl 0305.34043)