[1] Bai, Z., Du, Z.: Positive solutions for some second-order four-point boundary value problems. J. Math. Anal. Appl. 330, 34–50 (2007), MathSciNet Article Google Scholar
[2] Bai, Z., Li, W., Ge, W.: Existence and multiplicity of solutions for four-point boundary value problems at resonance. Nonlinear Anal. 60, 1151–1162 (2005), MathSciNet Article Google Scholar
[3] Bai, Z., Zhang, Y.: Solvability of fractional three-point boundary value problems with nonlinear growth. Appl. Math. Comput. 218, 1719–1725 (2011) MathSciNet MATH Google Scholar
[4] Bereanu, C., Jebelean, P., Mawhin, J.: Radial solutions for some nonlinear problems involing mean curvature operators in Euclidean and Minkowski spaces. Proc. Am. Math. Soc. 137, 161–169 (2009), Article Google Scholar
[5] Bereanu, C., Jebelean, P., Mawhin, J.: Radial solutions for Neumann problems involving mean curvature operators in Euclidean and Minkowski spaces. Math. Nachr. 283, 379–391 (2010), MathSciNet Article Google Scholar
[6] Bereanu, C., Jebelean, P., Mawhin, J.: Periodic solutions of pendulum-like perturbations of singular and bounded φ-Laplacians. J. Dyn. Differ. Equ. 22, 463–471 (2010) MathSciNet Article Google Scholar
[7] Bereanu, C., Mawhin, J.: Existence and multiplicity results for some nonlinear problems with singular φ-Laplacian. J. Differ. Equ. 243, 536–557 (2007), MathSciNet Article Google Scholar
[8] Brezis, H., Mawhin, J.: Periodic solutions of the forced relativistic pendulum. Differ. Integr. Equ. 23, 801–810 (2010), MathSciNet MATH Google Scholar
[9] Coelho, I., Corsato, C., Obersnel, F., Omari, P.: Positive solutions of the Dirichlet problem for the one-dimensional Minkowski-curvature equation. Adv. Nonlinear Stud. 12, 621–638 (2012), MathSciNet Article Google Scholar
[10] Feng, M., Li, P., Sun, S.: Symmetric positive solutions for fourth-order n-dimensional m-Laplace system. Bound. Value Probl. (2018). https://doi.org/10.1186/s13661-018-0981-3, MathSciNet Article Google Scholar
[11] Guo, D., Lakshmikantham, V.: Nonlinear Problems in Abstract Cones. Academic Press, San Diego (1988), MATH Google Scholar
[12] Herlea, D.-R.: Positive solutions for second-order boundary-value problems with φ-Laplacian. Electron. J. Differ. Equ. 2016(51), 1–12 (2016), MathSciNet Google Scholar
[13] Herlea, D.-R., Precup, R.: Existence, localization and multiplicity of positive solutions to φ-Laplace equations and systems. Taiwan J. Math. 20, 77–89 (2016), MathSciNet Article Google Scholar
[14] Jebelean, P., Mawhin, J., Şerban, C.: A vector p-Laplacian type approach to multiple periodic solutions for the p-relativistic operator. Commun. Contemp. Math. 19, 1–16 (2017), MathSciNet Article Google Scholar
[15] Jebelean, P., Precup, R.: Symmetric positive solutions to a singular φ-Laplace equation. J. Lond. Math. Soc. 99, 495–515 (2019), MathSciNet Article Google Scholar
[16] Jebelean, P., Şerban, C.: Boundary value problems for discontinuous perturbations of singular φ-Laplacian operator. J. Math. Anal. Appl. 431, 662–681 (2015), MathSciNet Article Google Scholar
[17] Krasnoselskii, M.A.: Positive Solutions of Operator Equations. Noordhoff, Groningen (1964), Google Scholar
[18] Kwong, M.K., Wong, J.S.W.: An optimal existence theorem for positive solutions of a four-point boundary value problem. Electron. J. Differ. Equ. 2009(165), 1–8 (2009), MathSciNet Google Scholar
[19] Ma, R., Lu, Y.: Multiplicity of positive solutions for second order nonlinear Dirichlet problem with one-dimension Minkowski-curvature operator. Adv. Nonlinear Stud. 15, 798–803 (2015), MathSciNet Article Google Scholar
[20] Precup, R., Rodríguez-López, J.: Positive solutions for discontinuous problems with applications to φ-Laplacian equations. J. Fixed Point Theor. Appl. 20, 1–17 (2018). Article 156, MathSciNet Article Google Scholar
[21] Rachunkova, I.: Upper and lower solutions and topological degree. J. Math. Anal. Appl. 234, 311–327 (1999), MathSciNet Article Google Scholar
[22] Schmitt, K.: On the existence of nontrivial solutions of differential equations subject to linear constraints. Rend. Inst. Mat. Univ. Trieste 49, 27–40 (2017), MathSciNet Google Scholar
[23] Sheng, K., Zhang, W., Bai, Z.: Positive solutions to fractional boundary value problems with p-Laplacian on time scales. Bound. Value Probl. 2018(1), 70 (2018), MathSciNet Article Google Scholar
[24] Tian, Y., Wei, Y., Sun, S.: Multiplicity for fractional differential equations with p-Laplacian. Bound. Value Probl. 2018(1), 127 (2018), MathSciNet Article Google Scholar
[25] Zhang, G., Sun, J.: Positive solutions of m-point boundary value problems. J. Math. Anal. Appl. 291, 406–418 (2004), MathSciNet Article Google Scholar