@article{TM_1989_186_a0,
     author = {G. G. Chernii},
     title = {Preface},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {3},
     publisher = {mathdoc},
     volume = {186},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1989_186_a0/}
}