@article{DCG_1986__1_130986,
     author = {G. Ewald},
     title = {Spherical {Complexes} and {Nonprojective} {Tone} {Varieties.}},
     journal = {Discrete & computational geometry},
     pages = {115--122},
     year = {1986},
     volume = {1},
     zbl = {0597.52009},
     url = {http://geodesic.mathdoc.fr/item/DCG_1986__1_130986/}
}