Switched step integral backstepping control for nonlinear motion systems with application to a laboratory helicopter. by A., Haruna, Z., Mohamed, Efe, M. Ö., A. M., Abdullahi

Dual boundary conditional integral backstepping control of a twin rotor MIMO system by Haruna, A., Mohamed, Z., Efe, M. O., Basri, M. A. M.

Improved integral backstepping control of variable speed motion systems with application to a laboratory helicopter by Haruna, A., Mohamed, Z., Efe, M. Ö., Basri, M. A. M.

Efficient swing control of an overhead crane with simultaneous payload hoisting and external disturbances by Ramli, L., Mohamed, Z., Efe, M. Ö., Lazim, I. M., Jaafar, H. I.