El-Gendi, S., & Hassan, A. (1969). Solution of Variational Problems with Bounded Control Variables. The Institute of National Planning.
Παραπομπή σε μορφή Chicago (17η εκδ.)El-Gendi, Slah, και Ahmed Hassan. Solution of Variational Problems with Bounded Control Variables. Cairo: The Institute of National Planning, 1969.
Παραπομπή σε μορφή MLA (9th εκδ.)El-Gendi, Slah, και Ahmed Hassan. Solution of Variational Problems with Bounded Control Variables. The Institute of National Planning, 1969.