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• ForewordVain, Jüri; Uustalu, TarmoProceedings of the Estonian Academy of Sciences. Physics. Mathematics2003 / 4, p. 334 https://artiklid.elnet.ee/record=b1014450*est
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• PrefaceEngelbrecht, Jüri; Maugin, Gerard A.Proceedings of the Estonian Academy of Sciences. Physics. Mathematics2007 / p. 73-74 https://www.ester.ee/record=b1072098*est
• PrefaceEngelbrecht, Jüri; Maugin, GerardProceedings of the Estonian Academy of Sciences. Physics. Mathematics2003 / p. 3-4 https://www.ester.ee/record=b1072098*est
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• The state-space description of two-rate nonlinear multivariable discrete systemsAstrov, Igor; Rüstern, EnnuProceedings of the Estonian Academy of Sciences. Physics. Mathematics1997 / 3, p. 187-196
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