@article{GDZPPN000363057, title = {Spherical Complexes and Nonprojective Tone Varieties.}, journal = {Discrete \& computational geometry}, volume = {1}, year = {1986}, pages = {115-122}, zbl = {0597.52009}, url = {http://dml.mathdoc.fr/item/GDZPPN000363057} }
Ewald, G. Spherical Complexes and Nonprojective Tone Varieties.. Discrete & computational geometry, Tome 1 (1986) pp. 115-122. http://gdmltest.u-ga.fr/item/GDZPPN000363057/