Reference
A. Beck,Continuous Flows in the Plane, Grundlehren der Mathematischen Wissenschaften, Vol. 201, Springer-Verlag, Heidelberg, 1974.
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This research was supported by the National Science Foundation.
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Beck, A. A necessary and sufficient condition for planar flows. Math. Systems Theory 9, 51–56 (1975). https://doi.org/10.1007/BF01698125
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DOI: https://doi.org/10.1007/BF01698125