APA (7th ed.) Citation

Liu, L., Zhang, X., & Wu, Y. H. (2007). Positive solutions of fourth-order nonlinear singular Sturm-Liouville eigenvalue problems. Elsevier.

Chicago Style (17th ed.) Citation

Liu, L., X. Zhang, and Yong Hong Wu. Positive Solutions of Fourth-order Nonlinear Singular Sturm-Liouville Eigenvalue Problems. Elsevier, 2007.

MLA (9th ed.) Citation

Liu, L., et al. Positive Solutions of Fourth-order Nonlinear Singular Sturm-Liouville Eigenvalue Problems. Elsevier, 2007.