Eric S. Fisher Steven Fortune Martin K. Gladstein Suresh Goyal William B. Lyons James H. Mosher Jr. Gordon T. Wilfong Economic modeling of global test strategy I: Mathematical models. 161-173 2007 12 Bell Labs Technical Journal 1 http://dx.doi.org/10.1002/bltj.20224 db/journals/bell/bell12.html#FisherFGGLMW07