1. Bingham, N.H., Goldie, C.M., Teugels, J.L.: Regular Variation. Encyclopedia of Mathematics and its Applications, vol. 27. Cambridge University Press, Cambridge (1987)
2. Chanturia, T.A., Kiguradze, I.T.: Asymptotic Properties of Solutions of Nonautonomous Ordinary Differential Equations. Mathematics and its Applications 89. Kluwer, Dordrecht (1993)
3. Cecchi, M., Došlá, Z., Marini, M., Vrkoč, I.: Integral conditions for nonoscillation of second order nonlinear differential equations. Nonlinear Anal. 64, 1278–1289 (2006)
4. Clément, P., Manásevich, R., Mitidieri, E.: Positive solutions for a quasilinear systems via blow up. Comm. Partial Differ. Equ. 18, 2071–2106 (1993)
5. Dalmasso, R.: Existence of positive solutions to Dirichlet boundary-value problems for some recursive differential systems. Differ. Integral Equ. 24, 829–944 (2011)