Here is the CMT Uptime check phrase
PUBLICATIONS

Level-Of-Effort Paradata and Nonresponse Adjustment Models for a National Face-To-Face Survey

Wagner, James Robert; Valliant, Richard L; Hubbard, Frost; Jiang, Li. (2014). Level-Of-Effort Paradata and Nonresponse Adjustment Models for a National Face-To-Face Survey. Journal of Survey Statistics and Methodology. 2(4), 410-432.