@article{DAN_1971_196_3_a7,
     author = {V. L. Murskii},
     title = {Unrecognizable properties of finite systems of identity relations},
     journal = {Doklady Akademii Nauk},
     pages = {520--522},
     publisher = {mathdoc},
     volume = {196},
     number = {3},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_196_3_a7/}
}