Moran Feldman, Guy Kortsarz, Zeev Nutov. Improved approximation algorithms for Directed Steiner Forest. J. Comput. Syst. Sci., 78(1):279-292, 2012. [doi]
@article{FeldmanKN12,
title = {Improved approximation algorithms for Directed Steiner Forest},
author = {Moran Feldman and Guy Kortsarz and Zeev Nutov},
year = {2012},
doi = {10.1016/j.jcss.2011.05.009},
url = {http://dx.doi.org/10.1016/j.jcss.2011.05.009},
researchr = {https://researchr.org/publication/FeldmanKN12},
cites = {0},
citedby = {0},
journal = {J. Comput. Syst. Sci.},
volume = {78},
number = {1},
pages = {279-292},
}