Mkrtumyan, R. R. A special linear second order equation. (Russian. English summary) Zbl 0563.34004 Dokl. Akad. Nauk BSSR 29, 213-215 (1985). MSC: 34A25 34A30 PDF BibTeX XML Cite \textit{R. R. Mkrtumyan}, Dokl. Akad. Nauk BSSR 29, 213--215 (1985; Zbl 0563.34004)
Lukashevich, N. A.; Mkrtumyan, R. R. Linear equations of second order with special particular solutions. (Russian) Zbl 0406.34013 Dokl. Akad. Nauk BSSR 23, 488-491 (1979). MSC: 34A30 PDF BibTeX XML Cite \textit{N. A. Lukashevich} and \textit{R. R. Mkrtumyan}, Dokl. Akad. Nauk BSSR 23, 488--491 (1979; Zbl 0406.34013)