@article{10_21136_CMJ_1992_128304,
     author = {Ton, Dao-Rong},
     title = {Product radical classes of $\ell$-groups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {129--142},
     publisher = {mathdoc},
     volume = {42},
     number = {1},
     year = {1992},
     doi = {10.21136/CMJ.1992.128304},
     mrnumber = {1152176},
     zbl = {0773.06019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1992.128304/}
}