Amir Ben-Dor Richard M. Karp Benno Schwikowski Zohar Yakhini Universal DNA Tag Systems: A Combinatorial Design Scheme. 503-519 2000 7 Journal of Computational Biology 3-4 db/journals/jcb/jcb7.html#Ben-DorKSY00 http://dx.doi.org/10.1089/106652700750050916