Source : Free On-Line Dictionary of Computing

ALGOL 68-R
     
         A restriction of {ALGOL 68} permitting {one-pass
        compilation}, developed at the Royal Signals Radar
        Establishment, Malvern, Worcester, UK in April 1970.
     
        {Identifiers}, modes and operators must be declared before
        use.  There is no {automatic proceduring} and no
        {concurrency}.  It was implemented in {ALGOL 60} under {GEORGE
        3} on an {ICL 1907F}.
     
        ["ALGOL 68-R, Its Implementation and Use", I.F. Currie et al,
        Proc IFIP Congress 1971, N-H 1971, pp. 360-363].
     
        (1995-05-03)