@article{JGG_2013_17_2_JGG_2013_17_2_a5,
     author = {M. Hagemann and D. Klawitter and D. Lordick },
     title = {Force {Driven} {Ruled} {Surfaces}},
     journal = {Journal for geometry and graphics},
     pages = {193--204},
     publisher = {mathdoc},
     volume = {17},
     number = {2},
     year = {2013},
     url = {http://geodesic.mathdoc.fr/item/JGG_2013_17_2_JGG_2013_17_2_a5/}
}