Scheiber, Ernest. “On the Convergence of a Method for Solving Two Point Boundary Value Problems by Optimal Control”. Rev. Anal. Numér. Théor. Approx. 31, no. 2 (August 1, 2002): 217–227. Accessed September 3, 2025. https://www.ictp.acad.ro/jnaat/journal/article/view/2002-vol31-no2-art13.