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This work has been aprtially supported by the National Science Foundation under Contract NSF GP-1904.
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Lima, E.L. Common singularities of commuting vector fields on 2-manifolds. Commentarii Mathematici Helvetici 39, 97–110 (1964). https://doi.org/10.1007/BF02566947
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DOI: https://doi.org/10.1007/BF02566947