%0 Journal Article %A Ross, David %T Tree self-embeddings %J Canadian mathematical bulletin %D 1989 %P 30-33 %V 32 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1989-005-7/ %R 10.4153/CMB-1989-005-7 %F 10_4153_CMB_1989_005_7