On exterior derivatives and solutions of ordinary differential equations

On exterior derivatives and solutions of ordinary differential equations
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Trans. Amer. Math. Soc. 91 (1959), 277-293

DOI: https://doi.org/10.1090/S0002-9947-1959-0109236-1

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References

Leçons sur les invariants intégraux

Variationsrechnung und partielle Differentialgleichungen erster Ordnung

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Ueber die Bestimmung einer geschlossenen konvexen Fläche durch ihr Linienelement