1. Il’in, V.A., Mosiseev, E.I.: Nonlocal boundary value problem of the first kind for a Sturm–Liouville operator in its differential and finite difference aspects. Electron. J. Differ. Equ. 23, 803 (1987)
2. Gupta, C.P.: Solvability of a three points nonlinear boundary value problem for a second order differential equation. J. Math. Anal. Appl. 168, 540–551 (1992)
3. Feng, W., Webb, J.R.L.: Solvability of three-point boundary value problem at resonance. Nonlinear Anal. 30, 322–323 (1997)
4. Gupta, C.P., Trofimchuk, S.I.: Solvability of a multipoint boundary value problem and related a priori estimates. Can. Appl. Math. Q. 6, 45–60 (1995)
5. Han, B., Yang, Y.: An integro-PDE model with variable motility. Nonlinear Anal., Real World Appl. 45, 186–199 (2019)