@article{JGG_2000_4_1_a3,
     author = {S. Zacharias and D. Velichova},
     title = {Projection from {4D} to {3D}},
     journal = {Journal for geometry and graphics},
     pages = {055--07},
     publisher = {mathdoc},
     volume = {4},
     number = {1},
     year = {2000},
     url = {http://geodesic.mathdoc.fr/item/JGG_2000_4_1_a3/}
}