1. On additive ideal theory in general rings;Curtis, Charles W.;Amer. J. Math.,1952
2. On primal ideals;Fuchs, Ladislas;Proc. Amer. Math. Soc.,1950
3. On a special property of the principal components of an ideal;Fuchs, Ladislas;Norske Vid. Selsk. Forh., Trondheim,1949
4. Zur Theorie der zweiseitigen Ideale in nichtkommutativen Bereichen;Krull, Wolfgang;Math. Z.,1928
5. Prime ideals in general rings;McCoy, Neal H.;Amer. J. Math.,1949