TY  - JOUR
AU  - Bing Yao
AU  - Ming Yao
AU  - Hui Cheng
TI  - On Gracefulness of Directed Trees with Short Diameters
JO  - Bulletin of the Malaysian Mathematical Society
PY  - 2012
VL  - 35
IS  - 1
UR  - http://geodesic.mathdoc.fr/item/BMMS_2012_35_1_a11/
ID  - BMMS_2012_35_1_a11
ER  -