%0 Journal Article
%A Yamashita, Shinji
%T Derivatives and Length-Preserving Maps
%J Canadian mathematical bulletin
%D 1987
%P 379-384
%V 30
%N 3
%U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1987-056-x/
%R 10.4153/CMB-1987-056-x
%F 10_4153_CMB_1987_056_x