Zhi-Zhong Chen Lusheng Wang Improved Approximation Algorithms for Reconstructing the History of Tandem Repeats. 438-453 2009 6 IEEE/ACM Trans. Comput. Biology Bioinform. 3 http://doi.acm.org/10.1145/1577987.1577994 db/journals/tcbb/tcbb6.html#ChenW09