On value selectors and torsion classes of lattice ordered groups Ján Jakubík (1981) Czechoslovak Mathematical Journal Similarity:
Closure operators on the lattice of radical classes of lattice ordered groups Ján Jakubík (1988) Czechoslovak Mathematical Journal Similarity:
On torsion classes generated by radical classes of lattice ordered groups Ján Jakubík (1990) Archivum Mathematicum Similarity: