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Nandakumaran, A. K.; Panigrahi, S. Oscillation criteria for differential equations of second order. (English) Zbl 1240.34179 Math. Slovaca 59, No. 4, 433-454 (2009). MSC: 34C10 PDFBibTeX XMLCite \textit{A. K. Nandakumaran} and \textit{S. Panigrahi}, Math. Slovaca 59, No. 4, 433--454 (2009; Zbl 1240.34179) Full Text: DOI