Bugir, M. K.; Dobrotvor, I. G. Conditions of oscillability for a class of fourth order nonlinear differential equations. (Russian) Zbl 0733.58041 Asymptotic methods in problems of mathematical physics, Collect. Sci. Works, Kiev, 27-36 (1989). Reviewer: G.Hedstrom (Livermore) MSC: 58J32 35G25 PDF BibTeX XML
Dobrotvor, I. G.; Bugir, M. K. An oscillation criterion for the solutions of fourth order partial differential equations. (Russian. English summary) Zbl 0668.35004 Dokl. Akad. Nauk Ukr. SSR, Ser. A 1988, No. 5, 9-11 (1988). Reviewer: J.Appell MSC: 35B05 35G99 PDF BibTeX XML Cite \textit{I. G. Dobrotvor} and \textit{M. K. Bugir}, Dokl. Akad. Nauk Ukr. SSR, Ser. A 1988, No. 5, 9--11 (1988; Zbl 0668.35004)