@article{JGG_2010_14_2_JGG_2010_14_2_a2,
     author = {G. Nawratil },
     title = {Flexible {Octahedra} in the {Projective} {Extension} of the {Euclidean} {3-Space}},
     journal = {Journal for geometry and graphics},
     pages = {147--169},
     publisher = {mathdoc},
     volume = {14},
     number = {2},
     year = {2010},
     url = {http://geodesic.mathdoc.fr/item/JGG_2010_14_2_JGG_2010_14_2_a2/}
}