@article{VMUMM_1990_3_a23,
     author = {B. Zekovi\'c},
     title = {Universal covering rings of simple generalized rings},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {100--103},
     publisher = {mathdoc},
     number = {3},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1990_3_a23/}
}