T. J. Fill, “PEG Prediction Corrections,” Shuttle Memo 10E-80-11, The Charles Stark Draper Laboratory, Inc., Cambridge, MA, March 1980.
And this isn't a request to violate copyright, if that's an issue. I would think it would be accessible via NTRS or some other online library like that. I can't see anywhere that I could pay CSDL to obtain access to it. I don't know of any library where these CSDL memos would be accessible.