@article{BAG_1974__2_138090,
     author = {E. HERTEL},
     title = {Ein {Subtraktionssatz} der {Polyederalgebra}},
     journal = {Beitr\"age zur Algebra und Geometrie},
     pages = {83--86},
     publisher = {mathdoc},
     volume = {2},
     year = {1974},
     zbl = {0284.52002},
     url = {http://geodesic.mathdoc.fr/item/BAG_1974__2_138090/}
}