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Discrete Dynamics in Nature and Society. An International Multidisciplinary Research and Review Journal (Discrete Dyn. Nat. Soc.) (20080101), Art ID 193872, 7~pp. ISSN: 1026-0226 (print).eISSN: 1607-887X.
Discrete Dynamics in Nature and Society. An International Multidisciplinary Research and Review Journal (Discrete Dyn. Nat. Soc.) (20080101), Art ID 243291, 6~pp. ISSN: 1026-0226 (print).eISSN: 1607-887X.