Kiskinov, Hristo; Zahariev, Andrey; Zlatev, Stoyan On the permanence of the positive absolutely continuous solutions of the generalized Mackey-Glass model. (English) Zbl 1449.34289 Nauchni Tr., Plovdivski Univ., Mat. 39, No. 3, 43-52 (2012). MSC: 34K60 34K25 34K20 92C35 PDFBibTeX XMLCite \textit{H. Kiskinov} et al., Nauchni Tr., Plovdivski Univ., Mat. 39, No. 3, 43--52 (2012; Zbl 1449.34289) Full Text: Link
Kostadinov, G.; Zahariev, A. \(L_p\)-equivalence between two ordinary impulse differential equations with bounded linear impulse operators in a Banach Space. (English) Zbl 1449.34048 Nauchni Tr., Plovdivski Univ., Mat. 38, No. 3, 37-45 (2011). MSC: 34A37 47H10 34C41 34G20 PDFBibTeX XMLCite \textit{G. Kostadinov} and \textit{A. Zahariev}, Nauchni Tr., Plovdivski Univ., Mat. 38, No. 3, 37--45 (2011; Zbl 1449.34048) Full Text: Link
Geshev, A.; Zakhariev, A.; Kostadinov, S. On a criterion for compactness of sets in sup-topology. (Bulgarian. German, Russian summaries) Zbl 0641.54012 Nauchni Tr., Plovdivski Univ., Mat. 24, No. 2, 141-146 (1986). MSC: 54C35 54D30 PDFBibTeX XMLCite \textit{A. Geshev} et al., Nauchni Tr., Plovdivski Univ., Mat. 24, No. 2, 141--146 (1986; Zbl 0641.54012)
Zakhariev, A. \(\mu\)-invariant operators and their applications. (Bulgarian. German, Russian summaries) Zbl 0641.34064 Nauchni Tr., Plovdivski Univ., Mat. 24, No. 2, 209-218 (1986). MSC: 34K99 34C10 47E05 PDFBibTeX XMLCite \textit{A. Zakhariev}, Nauchni Tr., Plovdivski Univ., Mat. 24, No. 2, 209--218 (1986; Zbl 0641.34064)
Zakhariev, A. Oscillator results for operator-differential equations with a \(\mu\)-invariant operator. (Bulgarian. German, Russian summaries) Zbl 0641.34063 Nauchni Tr., Plovdivski Univ., Mat. 24, No. 2, 201-207 (1986). MSC: 34K99 34C10 PDFBibTeX XMLCite \textit{A. Zakhariev}, Nauchni Tr., Plovdivski Univ., Mat. 24, No. 2, 201--207 (1986; Zbl 0641.34063)
Geshev, A.; Zakhariev, A.; Kostadinov, S. On a linear integral operator of Volterra type. (Bulgarian. German, Russian summaries) Zbl 0634.45012 Nauchni Tr., Plovdivski Univ., Mat. 23, No. 1, 79-86 (1985). MSC: 45N05 45D05 PDFBibTeX XMLCite \textit{A. Geshev} et al., Nauchni Tr., Plovdivski Univ., Mat. 23, No. 1, 79--86 (1985; Zbl 0634.45012)
Zakhariev, A.; Kostadinov, S. On an application of the Leray-Schauder fixed point theorem. (Bulgarian. German, Russian summaries) Zbl 0604.47040 Nauchni Tr., Plovdivski Univ., Mat. 22, No. 2, 75-78 (1984). MSC: 47J05 47H10 PDFBibTeX XMLCite \textit{A. Zakhariev} and \textit{S. Kostadinov}, Nauchni Tr., Plovdivski Univ., Mat. 22, No. 2, 75--78 (1984; Zbl 0604.47040)
Zakhariev, A.; Kostadinov, S. Über eine Klasse von Operatorungleichungen mit monotonem Operator. (Bulgarian. German, Russian summaries) Zbl 0598.45020 Nauchni Tr., Plovdivski Univ., Mat. 22, No. 2, 67-73 (1984). MSC: 45N05 47H07 45P05 PDFBibTeX XMLCite \textit{A. Zakhariev} and \textit{S. Kostadinov}, Nauchni Tr., Plovdivski Univ., Mat. 22, No. 2, 67--73 (1984; Zbl 0598.45020)