@article{CM_1951__8__76_0, author = {Levitzki, Jakob}, title = {On multiplicative systems}, journal = {Compositio Mathematica}, pages = {76--80}, publisher = {Kraus Reprint}, volume = {8}, year = {1951}, mrnumber = {33799}, zbl = {0033.34801}, language = {en}, url = {http://archive.numdam.org/item/CM_1951__8__76_0/} }