@article{CMUC_1992_33_3_a0,
     author = {Halter-Koch, Franz},
     title = {Relative block semigroups and their arithmetical applications},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {373--381},
     year = {1992},
     volume = {33},
     number = {3},
     mrnumber = {1209280},
     zbl = {0769.11038},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1992_33_3_a0/}
}