Kenneth A. Berman. Balanced vertex weightings and arborescences. Journal of Combinatorial Theory, Series A, 42(3):274-301, 1987. [doi]
@article{Berman87,
title = {Balanced vertex weightings and arborescences},
author = {Kenneth A. Berman},
year = {1987},
doi = {10.1016/0095-8956(87)90046-3},
url = {http://dx.doi.org/10.1016/0095-8956(87)90046-3},
researchr = {https://researchr.org/publication/Berman87},
cites = {0},
citedby = {0},
journal = {Journal of Combinatorial Theory, Series A},
volume = {42},
number = {3},
pages = {274-301},
}