David Fernández-Baca Jens Lagergren A Polynomial-Time Algorithm for Near-Perfect Phylogeny. 1115-1127 2003 32 SIAM J. Comput. 5 http://dx.doi.org/10.1137/S0097539799350839 db/journals/siamcomp/siamcomp32.html#Fernandez-BacaL03