[1] L. BICAN:
The lattice of гadical filters of a commutative noetherian ring. Comment. Math. Univ. Carolinae 12 (1971), 53-59.
MR 0284425
[2] L. BICAN P. JAMBOR T. KEPKA P. NĚMEC:
Rings with trivial torsion parts. Bull. Austгal. Math. Soc. 9 (1973), 275-290.
MR 0330206