[1]
D. Zamfir and C. Pal, “Nonlinear control of a series DC motors using singular perturbation and input - output linearization techniques”, The Annals of “Dunarea de Jos“ University of Galati. Fascicle III, Electrotechnics, Electronics, Automatic Control, Informatics, vol. 21, pp. 68-71, Dec. 1998.