El-Gendi, S., & Hassan, A. (1969). Solution of Variational Problems with Bounded Control Variables. The Institute of National Planning.
Chicago-referens (17:e uppl.)El-Gendi, Slah, och Ahmed Hassan. Solution of Variational Problems with Bounded Control Variables. Cairo: The Institute of National Planning, 1969.
MLA-referens (9:e uppl.)El-Gendi, Slah, och Ahmed Hassan. Solution of Variational Problems with Bounded Control Variables. The Institute of National Planning, 1969.