Ashish Goel, Ian Post. One Tree Suffices: A Simultaneous O(1)-Approximation for Single-Sink Buy-at-Bulk. Theory of Computing, 8(1):351-368, 2012. [doi]
@article{GoelP12,
title = {One Tree Suffices: A Simultaneous O(1)-Approximation for Single-Sink Buy-at-Bulk},
author = {Ashish Goel and Ian Post},
year = {2012},
doi = {10.4086/toc.2012.v008a015},
url = {http://dx.doi.org/10.4086/toc.2012.v008a015},
researchr = {https://researchr.org/publication/GoelP12},
cites = {0},
citedby = {0},
journal = {Theory of Computing},
volume = {8},
number = {1},
pages = {351-368},
}