@article{JRAM_1993__435_153487,
     author = {Franki Dillen and Stefan N\"olker},
     title = {Semi-parallelity, multi-roation surfaces and the helix-property.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {33--64},
     publisher = {mathdoc},
     volume = {435},
     year = {1993},
     zbl = {0770.53039},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1993__435_153487/}
}