@article{JRAM_1996__480_153864,
     author = {Victoria Powers and E. Becker},
     title = {Sums of powers in rings and the real holomorphy ring.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {71--104},
     publisher = {mathdoc},
     volume = {480},
     year = {1996},
     zbl = {0922.12003},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1996__480_153864/}
}