Picard, P.; Sename, O.; Lafay, J.F. - In: Mathematics and Computers in Simulation (MATCOM) 45 (1998) 3, pp. 223-233
Weak controllability concept is analysed for linear neutral delay-differential systems, according to an algebraic approach (ring theory). A geometric interpretation in terms of state trajectories is given, based on the definition of controllability indices.