%0 Journal Article
%A F. L. Litvin
%T Determination of the enveloping lines of contact of mutually enveloped surfaces
%J Izvestiâ vysših učebnyh zavedenij. Matematika
%D 1975
%P 47-50
%N 10
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IVM_1975_10_a4/
%G ru
%F IVM_1975_10_a4