Anastasova, K. I.; Stoeva, K. S.; Bobeva, A. N. Generalization of an inverse problem for a nonlinear equation of neutral type. (Bulgarian. English, Russian summaries) Zbl 0644.34070 God. Vissh. Uchebn. Zaved., Prilozhna Mat. 21(1985), No. 1, 101-112 (1986). Reviewer: I.Gumowski MSC: 34K99 34E05 × Cite Format Result Cite Review PDF
Milusheva, S. D.; Bajnov, D. D. Justification of the averaging method for boundary value problems for differential-functional equations of neutral type. (Russian. English summary) Zbl 0557.34064 God. Vissh. Uchebn. Zaved., Prilozhna Mat. 19(1983), No. 1, 79-88 (1984). MSC: 34K99 34C29 × Cite Format Result Cite Review PDF
Mollova, K. G. Construction of periodic solutions for the Mathieu equation with damping and delaying argument. (Bulgarian. English, Russian summaries) Zbl 0553.34049 God. Vissh. Uchebn. Zaved., Prilozhna Mat. 18(1982), No. 1, 85-100 (1983). MSC: 34K99 34C25 × Cite Format Result Cite Review PDF
Mollova, K. G. Determination of characteristic indices of the Mathieu equation with damping both with and without lag in the argument. (Bulgarian. English, Russian summaries) Zbl 0553.34048 God. Vissh. Uchebn. Zaved., Prilozhna Mat. 18(1982), No. 1, 75-84 (1983). MSC: 34K99 34C25 × Cite Format Result Cite Review PDF
Stoyanov, N. V.; Mishev, P. P. Properties of nonoscillatory solutions of higher order differential equations with deviating argument. (Bulgarian. English, Russian summaries) Zbl 0553.34046 God. Vissh. Uchebn. Zaved., Prilozhna Mat. 18(1982), No. 1, 9-22 (1983). MSC: 34K99 34C11 × Cite Format Result Cite Review PDF
Tochkov, G. On a differential equation of neutral type. (Bulgarian) Zbl 0526.34055 God. Vissh. Uchebn. Zaved., Prilozhna Mat. 17(1981), No. 3, 105-112 (1982). MSC: 34K99 × Cite Format Result Cite Review PDF
Mollova, K. G. Construction of periodic solutions for quasilinear second order differential equations with retarded argument with the help of an iteration method and an estimation of the convergence domain. (Bulgarian) Zbl 0506.34052 God. Vissh. Uchebn. Zaved., Prilozhna Mat. 17(1981), No. 3, 83-94 (1982). MSC: 34K99 34C25 34A34 × Cite Format Result Cite Review PDF
Konstantinov, M. M.; Bajnov, D. D. On the estimation of the value of the small parameter in the problem of the existence and uniqueness of a periodic solution for quasi-linear non- autonomous differential functional equations of neutral type. (Bulgarian) Zbl 0498.34052 God. Vissh. Uchebn. Zaved., Prilozhna Mat. 16(1980), No. 4, 231-238 (1981). MSC: 34K99 34C25 × Cite Format Result Cite Review PDF
Rashkov, P. I.; Stoyanov, N. V. The reduction principle for systems with a lag. (Russian) Zbl 0495.34034 God. Vissh. Uchebn. Zaved., Prilozhna Mat. 15(1979), No. 1, 9-28 (1980). MSC: 34K99 × Cite Format Result Cite Review PDF
Mollova, K. G. Periodic solutions of a quasi-linear non-autonomous system with retarded argument in the resonance case. (Bulgarian) Zbl 0441.34051 God. Vissh. Uchebn. Zaved., Prilozhna Mat. 14(1978), No. 2, 197-204 (1979). MSC: 34K99 34C25 34A34 × Cite Format Result Cite Review PDF
Akhmerov, R. R.; Kazakova, N. G. The averaging principle on an unbounded interval for functional- differential equation of neutral type. (Russian) Zbl 0435.34026 God. Vissh. Uchebn. Zaved., Prilozhna Mat. 14(1978), No. 3, 217-228 (1979). MSC: 34C11 34A34 34K99 × Cite Format Result Cite Review PDF
B”chvarov, S. N. Periodic solutions of quasi-linear non-autonomous of zero roots of the fundamental equation. (Bulgarian) Zbl 0435.34060 God. Vissh. Uchebn. Zaved., Prilozhna Mat. 13(1977), No. 3, 105-116 (1978). MSC: 34K99 34A34 34C25 × Cite Format Result Cite Review PDF
Werbowski, J. A. On oscillation of solutions of differential equations with deviating arguments. (Russian) Zbl 0411.34097 God. Vissh. Uchebn. Zaved., Prilozhna Mat. 11(1975), No. 3, 27-30 (1977). MSC: 34K99 34C10 × Cite Format Result Cite Review PDF
Rozhkov, V. I.; Arolska, M. A. Asymptotics of the periodical solution of a linear difference system with a small time lag depending on the argument. (Russian) Zbl 0409.34071 God. Vissh. Uchebn. Zaved., Prilozhna Mat. 11(1975), No. 3, 103-110 (1977). MSC: 34K99 34E05 34C25 34K25 39B62 × Cite Format Result Cite Review PDF
Konstantinov, M. M. Globally bounded solutions to a system of differential equations of superneutral type. (Russian) Zbl 0404.34055 God. Vissh. Uchebn. Zaved., Prilozhna Mat. 11(1975), No. 3, 37-46 (1977). MSC: 34K99 34C11 × Cite Format Result Cite Review PDF
Raskov, P. I.; Bilcev, S. I.; Docev, D. T.; Docev, D. Tr. Averaging in differential equations of neutral type with a great asymptotic delay in a Banach space. (Bulgarian) Zbl 0402.34064 God. Vissh. Uchebn. Zaved., Prilozhna Mat. 11(1975), No. 3, 95-101 (1977). MSC: 34K99 34G10 34E05 34C30 34C29 × Cite Format Result Cite Review PDF
Denkova, V. D.; Dimitrov, I. P. A construction of integral manifolds for differential equations with retarded argument in Banach space. (Bulgarian) Zbl 0402.34062 God. Vissh. Uchebn. Zaved., Prilozhna Mat. 11(1975), No. 3, 31-36 (1977). MSC: 34K99 34C30 34G10 × Cite Format Result Cite Review PDF
Ryabov, Yu. A.; Mollova, K. G. Die Duffingsche Gleichung mit retardiertem Argument im Resonanzfall. (Bulgarian) Zbl 0342.34060 God. Vissh. Uchebn. Zaved., Prilozhna Mat. 10(1974), No. 4, 31-37 (1975). MSC: 34K99 34C25 × Cite Format Result Cite Review PDF
Ryabov, Yu. A.; Mollova, K. G. Periodische Lösungen quasilinearer Differentialgleichungen zweiter Ordnung mit retardiertem Argument im Resonanzfall. (Bulgarian) Zbl 0342.34059 God. Vissh. Uchebn. Zaved., Prilozhna Mat. 10(1974), No. 4, 21-29 (1975). MSC: 34K99 34C25 × Cite Format Result Cite Review PDF
Anastasova, K. I. Ein inverses Problem für eine nichtlineare Gleichung neutralen Typs. (Bulgarian) Zbl 0337.34063 God. Vissh. Uchebn. Zaved., Prilozhna Mat. 10(1974), No. 3, 129-137 (1975). MSC: 34K05 34K99 × Cite Format Result Cite Review PDF
Anastasova, K. I. Ein inverses Problem für eine lineare Gleichung neutralen Typs. (Bulgarian) Zbl 0337.34062 God. Vissh. Uchebn. Zaved., Prilozhna Mat. 10(1974), No. 2, 77-89 (1975). MSC: 34K05 34K99 34A30 × Cite Format Result Cite Review PDF