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APA Citation
Lü, H., Agarwal, R. P., & O'Regan, D. (2009). an Approximation Approach to Eigenvalue Intervals for Singular Boundary Value Problems with Sign Changing and Superlinear Nonlinearities. Boundary value problems, 2009, . http://access.bl.uk/ark:/81055/vdc_100082250698.0x000040