Publications by Ioannis Sarras 2015 -- Jose Guadalupe Romero, Romeo Ortega, Ioannis SarrasA Globally Exponentially Stable Tracking Controller for Mechanical Systems Using Position Feedback 2013 -- I. Sarras, J.Á. Acosta, R. Ortega, A.D. MahindrakarConstructive immersion and invariance stabilization for a class of underactuated mechanical systems 2013 -- Paul Kotyczka, Ioannis SarrasOn the equivalence of two nonlinear control approaches: Immersion and invariance and IDA-PBC