%0 Journal Article %A W.T. Tutte %T On a pair of functional equations of combinatorial interest. %J Aequationes mathematicae %D 1978 %P 121-140 %V 17 %I mathdoc %U http://geodesic.mathdoc.fr/item/AM2_1978__17_136734/ %F AM2_1978__17_136734