@article{RM_1963_18_5_a12,
     author = {T. B. Belyaeva and V. A. Zalgaller},
     title = {An account of the theory of envelopes (a~methodological note)},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {18},
     number = {5},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1963_18_5_a12/}
}