Endre Boros Elsayed A. Elsayed Paul B. Kantor Fred Roberts Minge Xie Optimization Problems for Port-of-Entry Detection Systems. 319-335 2008 Intelligence and Security Informatics http://dx.doi.org/10.1007/978-3-540-69209-6_17 series/sci/2008-135 db/series/sci/sci135.html#BorosEKRX08