An O(log* n) Approximation Algorithm for the Asymmetric <i>p</i>-Center Problem.

Rina Panigrahy Sundar Vishwanathan An O(log* n) Approximation Algorithm for the Asymmetric <i>p</i>-Center Problem. 259-268 1998 27 J. Algorithms 2 db/journals/jal/jal27.html#PanigrahyV98