Naoyuki Kamiyama, Naoki Katoh. Covering directed graphs by in-trees. J. Comb. Optim., 21(1):2-18, 2011. [doi]
@article{KamiyamaK11,
title = {Covering directed graphs by in-trees},
author = {Naoyuki Kamiyama and Naoki Katoh},
year = {2011},
doi = {10.1007/s10878-009-9242-9},
url = {http://dx.doi.org/10.1007/s10878-009-9242-9},
tags = {graph-rewriting, rewriting},
researchr = {https://researchr.org/publication/KamiyamaK11},
cites = {0},
citedby = {0},
journal = {J. Comb. Optim.},
volume = {21},
number = {1},
pages = {2-18},
}