@article{MT_2001_4_2_a2,
     author = {A. E. Gutman and D. B. Ryabko},
     title = {The~Nonstandard {Hull} of {a~Normed} {Space} in {a~Boolean-valued} {Universe}},
     journal = {Matemati\v{c}eskie trudy},
     pages = {42--52},
     publisher = {mathdoc},
     volume = {4},
     number = {2},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_2001_4_2_a2/}
}