[1] R. P. Agarwal, H. Lu and D. O’regan, A necessary and
sufficient condition for existence of positive solutions to the
singular p-Laplacian, Journal for Analysis and its Applications 22
(2003), 649-710.
[2] R. P. Agarwal, D. Jiang, G. Chu and D. O’regan, Positive
solutions for continuous and discrete boundary value problems to one
dimensional p-Laplacian, Mathematical Inequalities and Applications
(2004), 523-534.
[3] M. A. Aizerman and F. R. Gantmacher, Absolute Stability of
Regulator Systems, Holden-day Inc., San Francisco, 1964.
[4] C. Corduneanu, Integral Equations and Stability of Feedback
Systems, Academic Press, New York, 1973.
[5] C. Corduneanu and M. Mahdavi, Asymptotic Behavior of Systems with
Abstract Voltera Operators, C. Corduneanu, Qualitative Problems for
Differential Equations and Control Theory, World Scientific Publishing
Co. Pte. Ltd., Singapore, (1995), 113-120.
[6] Y. Guo, Y. Gao and G. Zhang, Existence of positive solutions for
singular second order boundary value problems, Applied Mathematics
E-Notes 2 (2002), 125-131.
[7] A. Halanay, On the asymptotic behavior of the solutions of an
integro-differential equations, J. Math. Anal. Appl. 10 (1965),
319-324.
[8] J. M. Holtzman, Nonlinear System Theory - A Functional Analysis
Approach, Bell Telephone Laboratories, Inc., Whippany, New Jersey,
1970.
[9] P. Iosif, Nonstrict L’Hopital-type results for
monotonicity, Journal of Inequalities in Pure and Applied Mathematics
8(1) (2007).
[10] S. N. Kumpati and J. H. Taylor, Frequency Domain Criteria for
Absolute Stability, Academic Press, New York, 1973.
[11] D. O’regan, Existence Results for Nonlinear Integral
Equations on the Half Line, C. Corduneanu, Qualitative Problems for
Differential Equations and Control Theory, World Scientific Publishing
Co. Pte. Ltd., Singapore, (1995), 121-131.
[12] Tadie, On uniqueness conditions for decreasing solutions of
semilinear elliptic equations, Journal for Analysis and its
Applications 18 (1999), 517-523.
[13] H. Wang, Positive radial solutions for quasilinear systems in an
annulus, Elsevier Nonlinear Analysis (2005), 2494-2501.
[14] K. Yosida, Functional Analysis, Springer-Verlag, New York, 1971.