%0 Journal Article
%A V. I. Bernik
%T Induced extremal surfaces
%J Sbornik. Mathematics
%D 1977
%P 413-421
%V 32
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1977_32_4_a1/
%G en
%F SM_1977_32_4_a1