The Internet Archive has digitized a microfilm copy of this work. It may be possible to borrow a copy for reading.
W. E. Meserve, H. C. Torng. "Closure to "Discussion of 'Investigation of Periodic Modes of Sampled-Data Control Systems Containing a Saturating Element'" (1961, ASME J. Basic Eng., 83, p. 81)." Journal of Basic Engineering 83.1 (1961) 81