@article{MS2_1958__6_165677,
     author = {Douglas Derry},
     title = {On {Polygons} in {Real} {Projective} {n-Space.}},
     journal = {Mathematica Scandinavica},
     pages = {50--66},
     publisher = {mathdoc},
     volume = {6},
     year = {1958},
     zbl = {0083.17004},
     url = {http://geodesic.mathdoc.fr/item/MS2_1958__6_165677/}
}