DeWall, K.; Watkins, J. C. & Bramwell, D. Motor-operated valve (MOV) actuator motor and gearbox testing, report, July 1, 1997; (https://digital.library.unt.edu/ark:/67531/metadc689669/m1/1/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .