@article{GDZPPN002349175,
title = {Angle Sums of Convex Polytopes.},
journal = {Mathematica Scandinavica},
volume = {20},
year = {1967},
pages = {199-218},
zbl = {0172.23703},
url = {http://dml.mathdoc.fr/item/GDZPPN002349175}
}
Perles, M.A.; Shepard, G.C. Angle Sums of Convex Polytopes.. Mathematica Scandinavica, Tome 20 (1967) pp. 199-218. http://gdmltest.u-ga.fr/item/GDZPPN002349175/