%0 Journal Article %A Chen, Yi %T A Characterization of Some Geometries of Chains %J Canadian journal of mathematics %D 1974 %P 257-272 %V 26 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1974-027-5/ %R 10.4153/CJM-1974-027-5 %F 10_4153_CJM_1974_027_5