Il’kiv, V. S.; Polishchuk, V. N.; Ptashnik, B. I. The non-local boundary value problem for systems of pseudo-differential equations. (Russian) Zbl 0748.35060 Methods for the investigations of differential and integral operators, Collect. Sci. Works, Kiev, 75-79 (1989). Reviewer: V.S.Rabinovich (Rostov-na-Donu) MSC: 35S15 PDFBibTeX XMLCite \textit{V. S. Il'kiv} et al., in: The boundary value problem for differential-operator equations of an even order. . 75--79 (1989; Zbl 0748.35060)
Il’kiv, V. S.; Polishchuk, V. N.; Ptashnik, B. I.; Salyga, B. O. A nonlocal multipoint problem for pseudodifferential operators with analytic symbols. (English. Russian original) Zbl 0628.35090 Ukr. Math. J. 38, 496-500 (1986); translation from Ukr. Mat. Zh. 38, No. 5, 582-587 (1986). Reviewer: Yu.V.Egorov MSC: 35S15 35A20 35A22 35A05 PDFBibTeX XMLCite \textit{V. S. Il'kiv} et al., Ukr. Math. J. 38, 496--500 (1986; Zbl 0628.35090); translation from Ukr. Mat. Zh. 38, No. 5, 582--587 (1986) Full Text: DOI
Polishchuk, V. N.; Ptashnik, B. I. Periodic solutions of a system of partial differential equations with constant coefficients. (English) Zbl 0453.35007 Ukr. Math. J. 32, 151-154 (1980). MSC: 35B10 35E20 35D05 PDFBibTeX XMLCite \textit{V. N. Polishchuk} and \textit{B. I. Ptashnik}, Ukr. Math. J. 32, 151--154 (1980; Zbl 0453.35007) Full Text: DOI
Polishchuk, V. N.; Ptashnik, B. I. Periodische Lösungen eines Systems partieller Differentialgleichungen mit konstanten Koeffizienten. (Russian) Zbl 0435.35009 Ukr. Mat. Zh. 32, 239-243 (1980). MSC: 35B10 35E20 35D05 PDFBibTeX XMLCite \textit{V. N. Polishchuk} and \textit{B. I. Ptashnik}, Ukr. Mat. Zh. 32, 239--243 (1980; Zbl 0435.35009) Full Text: DOI
Ptashnik, B. I.; Polishchuk, V. N. Periodic solutions of a system of integro-differential equations of hyperbolic type. (Russian) Zbl 0571.45006 Nonlinear oscillations, Proc. 8th int. Conf., Prague 1978, Vol. 2, 1017-1022 (1979). MSC: 45K05 PDFBibTeX XML
Polishchuk, V. N.; Ptashnik, B. I. The periodic boundary-value problem for a system of hyperbolic equations with constant coefficients. (English) Zbl 0409.35056 Ukr. Math. J. 30, 248-253 (1978). MSC: 35L55 35B10 PDFBibTeX XMLCite \textit{V. N. Polishchuk} and \textit{B. I. Ptashnik}, Ukr. Math. J. 30, 248--253 (1978; Zbl 0409.35056) Full Text: DOI
Polishchuk, V. N.; Ptashnik, B. I. The periodic boundary value problem for systems of integrodifferential equations of hyperbolic type. (Ukrainian) Zbl 0405.35052 Questions of qualitative theory of differential equations and their applications, Collect. sci. Works, Acad. Sci. Ukr. SSR, Inst. Math., Kiev, 49-51 (1978). MSC: 35L55 45K05 35B10 47Gxx PDFBibTeX XML
Polishchuk, V. N.; Ptashnik, B. I. Über ein periodisches Randwertproblem für ein System hyperbolischer Gleichungen mit konstanten Koeffizienten. (Russian) Zbl 0387.35046 Ukr. Mat. Zh. 30, 326-333 (1978). MSC: 35L55 35B10 PDFBibTeX XMLCite \textit{V. N. Polishchuk} and \textit{B. I. Ptashnik}, Ukr. Mat. Zh. 30, 326--333 (1978; Zbl 0387.35046) Full Text: DOI