@misc{TM_1967_91_a0,
     title = {Preface},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {3--4},
     publisher = {mathdoc},
     volume = {91},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1967_91_a0/}
}