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@article{10_4064_cm_39_2_289_296, author = {Peter Wintgen}, title = {On the total curvature of surfaces in $E^4$}, journal = {Colloquium Mathematicum}, pages = {289--296}, publisher = {mathdoc}, volume = {39}, number = {2}, year = {1978}, doi = {10.4064/cm-39-2-289-296}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-39-2-289-296/} }
Peter Wintgen. On the total curvature of surfaces in $E^4$. Colloquium Mathematicum, Tome 39 (1978) no. 2, pp. 289-296. doi : 10.4064/cm-39-2-289-296. http://geodesic.mathdoc.fr/articles/10.4064/cm-39-2-289-296/
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