Kratochvíl, Alexandr; Nečas, Jindřich On the discretness of the spectrum of a certain Sturm-Liouville equation of fourth order. (Russian) Zbl 0229.34015 Commentat. Math. Univ. Carol. 12, 639-653 (1971). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 ReviewCited in 10 Documents MSC: 34B24 Sturm-Liouville theory PDFBibTeX XMLCite \textit{A. Kratochvíl} and \textit{J. Nečas}, Commentat. Math. Univ. Carol. 12, 639--653 (1971; Zbl 0229.34015)