@article{MZM_1988_44_4_a3,
     author = {A. A. Ivanov},
     title = {Simple, existentially closed extensions of unoids},
     journal = {Matemati\v{c}eskie zametki},
     pages = {449--456},
     publisher = {mathdoc},
     volume = {44},
     number = {4},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1988_44_4_a3/}
}