1. Integral inequalities of the Wirtinger type;Beesack;Duke Math. J.,1958
2. On the zeros of the solutions of the differential equation y(n)(z) + p(z)y(z) = 0;Hadass,1967
3. Convex distribution of the zeros of Sturm-Liouville functions;Hille;Bull. Amer. Math. Soc.,1922
4. Differentialgleichungen: Lösungsmethoden und Lösungen;Kamke,1948
5. The Schwarzian derivative and disconjugacy of n-th order linear differential equations;Lavie,1967