TY  - JOUR
AU  - Mullin, R. C.
TI  - On the Average Number of Trees in Certain Maps
JO  - Canadian journal of mathematics
PY  - 1966
SP  - 33
EP  - 41
VL  - 18
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1966-006-6/
DO  - 10.4153/CJM-1966-006-6
ID  - 10_4153_CJM_1966_006_6
ER  -