Mkrtumyan, R. R. Linear differential equations of second order with rational solutions. (Russian) Zbl 0518.34011 Differ. Uravn. 18, 713-716 (1982). MSC: 34A30 34A05 PDFBibTeX XMLCite \textit{R. R. Mkrtumyan}, Differ. Uravn. 18, 713--716 (1982; Zbl 0518.34011)
Mkrtumyan, R. R.; Shikova, R. N. Über die Meromorphizität der Lösungen gewisser Klassen linearer Differentialgleichungen. (Russian) Zbl 0421.34006 Differ. Uravn. 15, 2274-2277 (1979). MSC: 34M99 34A30 PDFBibTeX XMLCite \textit{R. R. Mkrtumyan} and \textit{R. N. Shikova}, Differ. Uravn. 15, 2274--2277 (1979; Zbl 0421.34006)
Mkrtumyan, R. R. On a linear equation of fourth order. (Russian) Zbl 0418.34001 Differ. Uravn. 15, 740-742 (1979). MSC: 34A05 34C20 34A30 PDFBibTeX XMLCite \textit{R. R. Mkrtumyan}, Differ. Uravn. 15, 740--742 (1979; Zbl 0418.34001)
Mkrtumyan, R. R. Über einen Fall der Integrierbarkeit einer linearen Gleichung zweiter Ordnung. (Russian) Zbl 0417.34005 Differ. Uravn. 15, 555-559 (1979). MSC: 34A05 34A30 PDFBibTeX XMLCite \textit{R. R. Mkrtumyan}, Differ. Uravn. 15, 555--559 (1979; Zbl 0417.34005)
Mkrtumjan, R. R. On a linear third order differential equation. (Russian) Zbl 0395.34012 Differ. Uravn. 14, 551-553 (1978). MSC: 34A30 47E05 PDFBibTeX XMLCite \textit{R. R. Mkrtumjan}, Differ. Uravn. 14, 551--553 (1978; Zbl 0395.34012)