Geodesic
Flexible Cross-Polytopes in the Euclidean 4-Space
Journal for geometry and graphics, Tome 4 (2000) no. 2, pp. 159-168.

Voir la notice de l'article provenant de la source Heldermann Verlag

It is shown that the examples presented 1998 by A. Walz are special cases of a more general class of flexible cross-polytopes in E4. The proof is given by means of 4D descriptive geometry. Further, a parameterization of the one-parameter self-motions of Walz's polytopes is presented. 
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     author = {H. Stachel},
     title = {Flexible {Cross-Polytopes} in the {Euclidean} {4-Space}},
     journal = {Journal for geometry and graphics},
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     volume = {4},
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     url = {http://geodesic.mathdoc.fr/item/JGG_2000_4_2_a5/}
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H. Stachel. Flexible Cross-Polytopes in the Euclidean 4-Space. Journal for geometry and graphics, Tome 4 (2000) no. 2, pp. 159-168. http://geodesic.mathdoc.fr/item/JGG_2000_4_2_a5/