@article{VMUMM_1989_5_a8,
     author = {V. G. Chirskii},
     title = {Nontrivial global relations},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {33--36},
     publisher = {mathdoc},
     number = {5},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1989_5_a8/}
}