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Additional information
Institute of Mathematics and Informatics, Akademijos 4, 2600 Vilnius, Lituania. Translated from Lietuvos Matematikos Rinkinys, Vol. 38, No. 1, pp. 75–81, January–March, 1998.
Translated by V. Mackevičius
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Janušauskas, A. Classification of second-order partial differential equation systems elliptic in the petrovskii sense. Lith Math J 38, 59–63 (1998). https://doi.org/10.1007/BF02465544
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DOI: https://doi.org/10.1007/BF02465544