Lefschetz, S. Differential equations: Geometric theory. 2nd ed. (English) Zbl 0107.07101 Pure and Applied Mathematics. Vol. 6. New York-London: Interscience Publishers, a division of John Wiley & Sons, X, 390 p. (1963). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 ReviewCited in 92 Documents Keywords:ordinary differential equations PDF BibTeX XML OpenURL