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L. V. Ovsyannikov, Group Analysis of Differential Equations (Nauka, Moscow, 1978) [in Russian].
L. V. Ovsyannikov, Dokl. Akad. Nauk 330(5), 559–561 (1993).
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Original Russian Text © Yu.A. Chirkunov, 2009, published in Doklady Akademii Nauk, 2009, Vol. 426, No. 5, pp. 605–607.
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Chirkunov, Y.A. Linear autonomy conditions for the basic Lie algebra of a system of linear differential equations. Dokl. Math. 79, 415–417 (2009). https://doi.org/10.1134/S1064562409030302
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DOI: https://doi.org/10.1134/S1064562409030302