1. I. M. Gel’fand and S. V. Fomin, Variation Calculus (Fizmatlit, Moscow, 1961) [in Russian].
2. F. A. Aliev, M. Kh. Il’yasov, and M. A. Dzhamalbekov, “Simulation of the operation of gaslift wells,” Dokl. Nats. Akad. Nauk Azerb., No. 4, 30–41 (2008).
3. F. A. Aliev, M. Kh. Il’yasov, and N. B. Nuriev, “Problems of modeling and optimal stabilization of the gas-lift process,” Int. Appl. Mech. 46 (6), 709–717 (2010).
4. F. A. Aliev and N. A. Ismailov, “Algorithm for calculating the coefficient of hydraulic resistance in the gaslift process,” Proc. IAM 2 (1), 3–10 (2013).
5. F. A. Aliev and M. M. Mutallimov, “Algorithm for constructing software trajectories and control in gaslift oil production,” Dokl. Nats. Akad. Nauk Azerb. 65 (5), 9–18 (2009).