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Author: Willems, Jan C.

• Nieuwenhuis, J. W.; Willems, Jan C.: On the nature of descriptor systems. (English). Kybernetika, vol. 27 (1991), issue 4, pp. 282-288
• Rocha, Paula; Willems, Jan C.: On the representation of 2-D systems. (English). Kybernetika, vol. 27 (1991), issue 3, pp. 225-230