= NASA Mass Accelerator, 1961 =

 . citation 75 in ''Permanent-Magnet DC Linear Motors'' by Amitava Basak, PSU TK2537.B29 1996
 . K. Thorne and J. Norwood, ''Theory of an electromagnetic mass accelerator for achieving hypervelocities.'' [[ https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19980227779.pdf | NASA Technical Note D886 ]] . . . [[ attachment:19980227779.pdf | local copy ]]