TY  - JOUR
AU  - Aimin Xu
TI  - Extensions of Spivey's Bell number formula
JO  - The electronic journal of combinatorics
PY  - 2012
VL  - 19
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.37236/2146/
DO  - 10.37236/2146
ID  - 10_37236_2146
ER  -