Mixed signal design watermarking for IP protection. - Rexford D. Newbould; David Irby; Jo Dale Carothers; Jeffrey J. Rodríguez; W. Timothy Holman (Integr. Comput. Aided Eng., 2003)

SpamCooker: A Method for Deterring Unsolicited Electronic Communications. - Nathan Denny; Theodore Elhourani; Jaime Denny; Scott Bissmeyer; David Irby (ITNG, 2006)