Leslie Ann Goldberg Paul W. Goldberg Mike Paterson Pavel A. Pevzner Süleyman Cenk Sahinalp Elizabeth Sweedyk The Complexity of Gene Placement. 225-243 2001 41 J. Algorithms 2 http://dx.doi.org/10.1006/jagm.2001.1172 db/journals/jal/jal41.html#GoldbergGPPSS01