%0 Journal Article
%A V. I. Berdyshev
%T Navigation by means of the field of altitudes and its fragment
%J Trudy Instituta matematiki i mehaniki
%D 2003
%P 26-37
%V 9
%N 1
%U http://geodesic.mathdoc.fr/item/TIMM_2003_9_1_a3/
%G ru
%F TIMM_2003_9_1_a3