Gilbert Labelle. Counting enriched multigraphs according to the number of their edges (or arcs). Discrete Mathematics, 217(1-3):237-248, 2000. [doi]
@article{Labelle00,
title = {Counting enriched multigraphs according to the number of their edges (or arcs)},
author = {Gilbert Labelle},
year = {2000},
doi = {10.1016/S0012-365X(99)00265-4},
url = {http://dx.doi.org/10.1016/S0012-365X(99)00265-4},
researchr = {https://researchr.org/publication/Labelle00},
cites = {0},
citedby = {0},
journal = {Discrete Mathematics},
volume = {217},
number = {1-3},
pages = {237-248},
}