[1] BICAN L., JAMBOR P., KEPKA T., NĚMEC P.:
Hereditary and cohereditary preradicals. (to appear).
MR 0414611
[2] BICAN L., JAMBOR P., KEPKA T., NĚMEC P.:
Stable and costable preradicals. (to appear).
MR 0387333
[3] BICAN L., JAMBOR P., KEPKA T., NĚMEC P.:
Preradicals and change of rings. (to appear).
MR 0374179