@article{PORMA_1990__47_3_115720,
     author = {Bokowski, J\"urgen and Guedes de Oliveira, A.},
     title = {Simplicial convex 4-polytopes do not have the isotopy property},
     journal = {Portugaliae mathematica},
     pages = {309--318},
     publisher = {mathdoc},
     volume = {47},
     number = {3},
     year = {1990},
     mrnumber = {1090270},
     zbl = {0714.52005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1990__47_3_115720/}
}