A Combinatorial Logarithmic Approximation Algorithm for the Directed Telephone Broadcast Problem

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@article{Elkin2005ACL, title={A Combinatorial Logarithmic Approximation Algorithm for the Directed Telephone Broadcast Problem}, author={Michael Elkin and Guy Kortsarz}, journal={SIAM J. Comput.}, year={2005}, volume={35}, pages={672-689} }