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Bliznikas, V. I.; Lupeikis, Z. Ju. Geometry of differential equations. (English) Zbl 0339.35003 J. Sov. Math. 4(1975), 591-623 (1976). MSC: 35A30 53-02 58A15 PDFBibTeX XMLCite \textit{V. I. Bliznikas} and \textit{Z. Ju. Lupeikis}, J. Sov. Math. 4, 591--623 (1976; Zbl 0339.35003) Full Text: DOI
Montgomery, D. Oswald Veblen. (English) Zbl 0107.00608 Bull. Am. Math. Soc. 69, 26-36 (1963). PDFBibTeX XMLCite \textit{D. Montgomery}, Bull. Am. Math. Soc. 69, 26--36 (1963; Zbl 0107.00608) Full Text: DOI