On multiplicative systems
Levitzki, Jakob
Compositio Mathematica, Tome 9 (1951), p. 76-80 / Harvested from Numdam
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@article{CM_1951__8__76_0,
     author = {Levitzki, Jakob},
     title = {On multiplicative systems},
     journal = {Compositio Mathematica},
     volume = {9},
     year = {1951},
     pages = {76-80},
     mrnumber = {33799},
     zbl = {0033.34801},
     language = {en},
     url = {http://dml.mathdoc.fr/item/CM_1951__8__76_0}
}

Levitzki, Jakob. On multiplicative systems. Compositio Mathematica, Tome 9 (1951) pp. 76-80. http://gdmltest.u-ga.fr/item/CM_1951__8__76_0/