Here is the CMT Uptime check phrase
PUBLICATIONS

Mode, Behavior, and Data Recording Accuracy

Lepkowski, James M; Sadosky, Sally A; Weiss, Paul S. (1998). Mode, Behavior, and Data Recording Accuracy. In Couper, Mick P., Baker, R. P., Bethlehem, J., Clark, C., Martin, J., Nicholls, William L., O'Reilly, J. (Ed.), Computer Assisted Survey Information Collection.