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[1] I. M. Singer S. Sternberg: The Infinite Groups of Lie and Cartan, Part I (The Transitive Groups). J. d'Anal. Math., vol. XV (1965), pp. 1-114. MR 0217822
[2] M. Kuranishi: Lectures on involutive systems of partial differential equations. Publiçacôes da Sociedade de Matemâtica de Sao Paulo, 1967. Zbl 0163.12001
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