%0 Journal Article
%A T. B. Belyaeva
%A V. A. Zalgaller
%T An account of the theory of envelopes (a~methodological note)
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1963
%V 18
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1963_18_5_a12/
%G ru
%F RM_1963_18_5_a12