@article{JGG_2019_23_1_JGG_2019_23_1_a2,
     author = {B. Hoffmann },
     title = {Rupert {Properties} of {Polyhedra} and the {Generalised} {Nieuwland} {Constant}},
     journal = {Journal for geometry and graphics},
     pages = {29--35},
     publisher = {mathdoc},
     volume = {23},
     number = {1},
     year = {2019},
     url = {http://geodesic.mathdoc.fr/item/JGG_2019_23_1_JGG_2019_23_1_a2/}
}