also in Franklin A. Long, Donald Haffner, and Jeffrey Boutwell (eds.), Weapons in Space, W.W. Norton & Co., 1986, pp. 257-278; exerpted in P. Edward Haley and Jack Merritt (eds.) Strategic Defense Initiative: Folly or Future?, Westview Press, 1986, pp. 139-150

In Working Paper No. 9, International Security Studies Program, the Wilson Center, Washington, D.C. Revised version in Social Studies of Science, May 1981, pp. 159 - 197