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Heikkola, E. (author), Mönkölä, S. (author), Pennanen, A. (author), Rossi, T. (author)We consider the use of controllability techniques to solve the Helmholtz equation. Instead of solving directly the time-harmonic equation, we return to the corresponding time-dependent equation and look for time-periodic solution. The convergence is accelerated with a control technique by representing the original time-harmonic equation as an...conference paper 2006