@article{DAN_1989_309_1_a8,
     author = {V. G. Pestov},
     title = {On a valued field introduced by {A.} {Robinson,} and structures},
     journal = {Doklady Akademii Nauk},
     pages = {43--46},
     year = {1989},
     volume = {309},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_309_1_a8/}
}