@article{ARM_1991_27_3-4_a11,
     author = {Lihov\'a, Judita},
     title = {Direct factors of directed groups},
     journal = {Archivum mathematicum},
     pages = {221--227},
     year = {1991},
     volume = {27},
     number = {3-4},
     mrnumber = {1189219},
     zbl = {0761.06009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1991_27_3-4_a11/}
}