@article{MM2_1992__75_4_155709,
     author = {Eberhard Teufel},
     title = {The isoperimetric inequality and the total absolute curvature of closed curves in spheres.},
     journal = {Manuscripta mathematica},
     pages = {43--48},
     publisher = {mathdoc},
     volume = {75},
     number = {4},
     year = {1992},
     zbl = {0754.53009},
     url = {http://geodesic.mathdoc.fr/item/MM2_1992__75_4_155709/}
}