@article{JGG_1998_2_1_a2,
     author = {R. Koch and C. Engelhart},
     title = {Closed {Space} {Curves} of {Constant} {Curvature} {Consisting} of {Arcs} of {Circular} {Helices}},
     journal = {Journal for geometry and graphics},
     pages = {017--032},
     publisher = {mathdoc},
     volume = {2},
     number = {1},
     year = {1998},
     url = {http://geodesic.mathdoc.fr/item/JGG_1998_2_1_a2/}
}