@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/}
}