A. M. A. El-Sayed, Zaki. F. A. EL-Raheem and N. A. O. Buhalima (2018) “Eigenfunction expansion of the Sturm-Liouville equation with a non-local boundary condition”, Malaya Journal of Matematik. India, 6(02), pp. 338–343. doi: 10.26637/MJM0602/0006.