TY  - JOUR
AU  - Tsoy-Wo Ma
TI  - Higher chain formula proved by combinatorics
JO  - The electronic journal of combinatorics
PY  - 2009
VL  - 16
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.37236/259/
DO  - 10.37236/259
ID  - 10_37236_259
ER  -