Matvij, O. V. Approximation of nonasymptotic roots of quasipolynomials of differential neutral equations with many delays. (Ukrainian. English summary) Zbl 1150.34536 Nauk. Visn. Chernivets’kogo Univ., Mat. 336-337, 109-111 (2007). MSC: 34K06 34K05 34K40 PDFBibTeX XMLCite \textit{O. V. Matvij}, Nauk. Visn. Chernivets'kogo Univ., Mat. 336--337, 109--111 (2007; Zbl 1150.34536)
Piddubna, L. A.; Cherevko, I. M. On approximation of asymptotic roots of quasipolynomials for systems of differential-difference equations of neutral type. (Ukrainian. English summary) Zbl 1071.34086 Nauk. Visn. Chernivets’kogo Univ., Mat. 191-192, 119-122 (2004). MSC: 34K40 34K20 PDFBibTeX XMLCite \textit{L. A. Piddubna} and \textit{I. M. Cherevko}, Nauk. Visn. Chernivets'kogo Univ., Mat. 191--192, 119--122 (2004; Zbl 1071.34086)