@article{JGG_2009_13_2_JGG_2009_13_2_a2,
     author = {V. W. de Spinadel and A. Redondo Buitrago },
     title = {Towards van der {Laan's} {Plastic} {Number} in the {Plane}},
     journal = {Journal for geometry and graphics},
     pages = {163--175},
     publisher = {mathdoc},
     volume = {13},
     number = {2},
     year = {2009},
     url = {http://geodesic.mathdoc.fr/item/JGG_2009_13_2_JGG_2009_13_2_a2/}
}