@article{MM2_1978__26_154584,
     author = {Franco Ghione and Alexandru T. Lascu},
     title = {Unisecant curves on a general ruled surface.},
     journal = {Manuscripta mathematica},
     pages = {169--178},
     publisher = {mathdoc},
     volume = {26},
     year = {1978},
     zbl = {0405.14004},
     url = {http://geodesic.mathdoc.fr/item/MM2_1978__26_154584/}
}