Bakhtiari-Nejad, F. .; Nazemizadeh, M. .; Arjmand, H. . Tracking Control of an Underactuated Gantry Crane Using an Optimal Feedback Controller. Int. J. Automot. Mech. Eng. 2022, 7, 830-839. https://doi.org/10.15282/ijame.7.2012.3.0068.