@article{MZM_1985_38_2_a3,
     author = {N. A. Peryazev},
     title = {Positive indistinguishability of algebraic systems, and completeness of positive theories},
     journal = {Matemati\v{c}eskie zametki},
     pages = {208--217},
     publisher = {mathdoc},
     volume = {38},
     number = {2},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1985_38_2_a3/}
}