1. Quotientbildung und Schiefringe;Asano;J. Math. Soc. Japan,1949
2. Semi-prime rings with maximum conditions;Goldie,1960
3. Sul teorema di Goldie;Herstein;Atti Accad. Naz. Rend. Cl. Sci. Fis. Mat. Nat.,1963
4. Nil rings satisfying certain chain conditions;Herstein;Canad. J. Math.,1964
5. Structure of rings;Jacobson,1956