@article{VMUMM_1989_3_a15,
     author = {B. V. Atamanyuk},
     title = {Functors of iterated superextension},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {58},
     year = {1989},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1989_3_a15/}
}