@article{10_21136_CMJ_1987_102134,
     author = {Darnel, Michael R.},
     title = {Closure operators on radical classes of lattice-ordered groups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {51--64},
     publisher = {mathdoc},
     volume = {37},
     number = {1},
     year = {1987},
     doi = {10.21136/CMJ.1987.102134},
     mrnumber = {875127},
     zbl = {0624.06022},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1987.102134/}
}