Load torque estimators in DC motor based wind turbine simulators - Nichita, Cristian; Istrate, Adrian; Ceangă, Emil; Bivol, Ion; Roșu, Emil; Vasilache, Cristian; Protin, Ludovic (The Annals of “Dunarea de Jos“ University of Galati. Fascicle III, Electrotechnics, Electronics, Automatic Control, Informatics, 1996)