@article{DBLP:journals/jct/Bang-Jensen91,
author = {J{\o}rgen Bang-Jensen},
title = {Edge-disjoint in- and out-branchings in tournaments and
related path problems},
journal = {J. Comb. Theory, Ser. B},
volume = {51},
number = {1},
year = {1991},
pages = {1-23},
ee = {http://dx.doi.org/10.1016/0095-8956(91)90002-2},
bibsource = {DBLP, http://dblp.uni-trier.de}
}