[1]
S. Pečiulyte, O. Štikoniene, and A. Štikonas, “Sturm‐Liouville problem for stationary differential operator with nonlocal integral boundary condition”, MMA, vol. 10, no. 4, pp. 377–392, Dec. 2005, doi: 10.3846/13926292.2005.9637295.