(C, A)-Invariance of Modules over Principal Ideal Domains. - Naoharu Ito; Wiland Schmale; Harald K. Wimmer (SIAM J. Control. Optim., 2000)

Systems of linear difference equations with bounded and robustly bounded solutions. - Naoharu Ito; Reinhold Küstner; Harald K. Wimmer (Artif. Life Robotics, 2012)