TY  - JOUR
AU  - Oystein Ore
TI  - A problem regarding the tracing of graphs.
JO  - Elemente der Mathematik
PY  - 1951
SP  - 49
EP  - 53
VL  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ELMA_1951__6_140566/
ID  - ELMA_1951__6_140566
ER  -