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@article{IM_1984__77_143137, author = {N.H. Kuiper and W. III Meeks}, title = {Total curvature for knotted surfaces.}, journal = {Inventiones mathematicae}, pages = {25--70}, publisher = {mathdoc}, volume = {77}, year = {1984}, zbl = {0553.53034}, url = {http://geodesic.mathdoc.fr/item/IM_1984__77_143137/} }
N.H. Kuiper; W. III Meeks. Total curvature for knotted surfaces.. Inventiones mathematicae, Tome 77 (1984), pp. 25-70. http://geodesic.mathdoc.fr/item/IM_1984__77_143137/