@article{DBLP:journals/mp/ChudakRW04,
author = {Fabi{\'a}n A. Chudak and
Tim Roughgarden and
David P. Williamson},
title = {Approximate {\it k}-MSTs and {\it k}-Steiner trees via
the primal-dual method and Lagrangean relaxation},
journal = {Math. Program.},
volume = {100},
number = {2},
year = {2004},
pages = {411-421},
ee = {http://dx.doi.org/10.1007/s10107-003-0479-2},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
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