1. V. A. Andrunakievich, "Radicals of associative rings. I," Matem. Sb.,44, No. 2, 179–212 (1958).
2. K. A. Zhevlakov, "Radical ideals of alternative rings," Algebra i Logika,4, No. 4, 87–102 (1965).
3. K. A. Zhevlakov, "On radicals in Neumann ideals," Algebra i Logika,8, No. 4, 425–439 (1969).
4. K. A. Zhevlakov, "Nilpotency of ideals in alternative rings," Tr. Mosk. Matem. O-va,29, 133–146 (1973).
5. R. É. Roomel'di, "Lower nilradical of (−1, 1)-rings," Algebra i Logika,12, No. 3, 323–332 (1973).