TY  - JOUR
AU  - Karel A. Post
TI  - Moessnerian theorems. How to prove them by simple graph theoretical inspection.
JO  - Elemente der Mathematik
PY  - 1990
SP  - 46
EP  - 51
VL  - 45
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ELMA_1990__45_6_141479/
ID  - ELMA_1990__45_6_141479
ER  -