@article{10_1090_S1079_6762_04_00137_4,
     author = {Ziegler, G\~A{\textonequarter}nter},
     title = {Projected products of polygons},
     journal = {Electronic research announcements of the American Mathematical Society},
     pages = {122--134},
     publisher = {mathdoc},
     volume = {10},
     year = {2004},
     doi = {10.1090/S1079-6762-04-00137-4},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S1079-6762-04-00137-4/}
}