Illinois FP. An interpreter written in portable C by Arch D. Robinson for a variant of Backus' FP with syntax like ALGOL or Modula-2. IFP Runs under Unix, CTSS (Cray) and MS-DOS. Version 0.5.

. Posted to comp.sources.unix volume 10.

["The Illinois Functional Programming Interpreter", A.D. Robison, Proc 1987 SIGPLAN Conf on Interpreters and Interpretive Techniques (June 1987), pp. 64-73].

["Illinois Functional Programming: A Tutorial", A.D. Robison, BYTE Feb 1987, pp. 115-125].