[W/K] :: POP-2

  POP-2
       
          Robin POPplestone, Edinburgh, 1967.  An innovative language
          incorporating many of Landin's ideas, including streams,
          closures, and functions as first-class citizens.  ALGOL-like
          syntax.  The first implementation was named Multi-POP, based
          on a REVPOL function written in POP-1, producing the
          reverse-polish form as output.  "POP-2 Papers", R.M.  Burstall
          et al, Oliver & Boyd 1968.  "Programming in POP-2",
          R.M. Burstall et al, Edinburgh U Press 1971.  "POP-2 User's
          Manual", R. Popplestone, Mach Intell 2, E. Dale et al eds,
          Oliver and Boyd, Edinburgh 1968.