Haag, Jules Cols, nœuds et foyers. (French) Zbl 0040.19401 Bull. Sci. Math., II. Ser. 74, 167-192 (1950). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Keywords:ordinary differential equations × Cite Format Result Cite Review PDF