Henderson, Johnny, Sotiris K. Ntouyas, and Ioannis K. Purnaras. “Positive Solutions for Systems of m‐point Nonlinear Boundary Value Problems”. Mathematical Modelling and Analysis 13, no. 3 (September 30, 2008): 357-370. Accessed February 25, 2025. https://aviation.vgtu.lt/index.php/MMA/article/view/7021.