@article{CMJ_2005__55_2_a0,
     author = {Chen, Huanyin and Chen, Miaosen},
     title = {Extensions of $GM$-rings},
     journal = {Czechoslovak Mathematical Journal},
     pages = {273--281},
     publisher = {mathdoc},
     volume = {55},
     number = {2},
     year = {2005},
     mrnumber = {2137137},
     zbl = {1081.16016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2005__55_2_a0/}
}