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Author: Zaballa, Ion

• Zaballa, Ion; Gracia, Juan M.: On difference linear periodic systems II. Non-homogeneous case. (English). Aplikace matematiky, vol. 30 (1985), issue 6, pp. 403-412
• Zaballa, Ion; Gracia, Juan M.: On difference linear periodic systems. I. Homogeneous case. (English). Aplikace matematiky, vol. 28 (1983), issue 4, pp. 241-248