Viet Hung Nguyen. Approximation Algorithm for the Minimum Directed Tree Cover. In Weili Wu, Ovidiu Daescu, editors, Combinatorial Optimization and Applications - 4th International Conference, COCOA 2010, Kailua-Kona, HI, USA, December 18-20, 2010, Proceedings, Part II. Volume 6509 of Lecture Notes in Computer Science, pages 144-159, Springer, 2010.
Abstract is missing.