@article{JGG_2016_20_2_JGG_2016_20_2_a0,
     author = {H. Al-Zoubi and S. Stamatakis },
     title = {Ruled and {Quadric} {Surfaces} {Satisfying} {\ensuremath{\Delta}\protect\textsuperscript{III}x} = {\ensuremath{\Lambda}} x},
     journal = {Journal for geometry and graphics},
     pages = {147--157},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {2016},
     url = {http://geodesic.mathdoc.fr/item/JGG_2016_20_2_JGG_2016_20_2_a0/}
}