@article{JGG_2013_17_2_JGG_2013_17_2_a4,
     author = {S. Stamatakis and I. Kaffas },
     title = {Ruled {Surfaces} {Asymptotically} {Normalized}},
     journal = {Journal for geometry and graphics},
     pages = {177--191},
     publisher = {mathdoc},
     volume = {17},
     number = {2},
     year = {2013},
     url = {http://geodesic.mathdoc.fr/item/JGG_2013_17_2_JGG_2013_17_2_a4/}
}