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@article{CMH_1964__39_139284, author = {Elon L. Lima}, title = {Common {Singularities} of {Commuting} {Vector} {Fields} on 2-manifolds.}, journal = {Commentarii mathematici Helvetici}, pages = {97--110}, publisher = {mathdoc}, volume = {39}, year = {1964}, zbl = {0124.16101}, url = {http://geodesic.mathdoc.fr/item/CMH_1964__39_139284/} }
Elon L. Lima. Common Singularities of Commuting Vector Fields on 2-manifolds.. Commentarii mathematici Helvetici, Tome 39 (1964), pp. 97-110. http://geodesic.mathdoc.fr/item/CMH_1964__39_139284/