Acta Informatica, Volume 27

Volume 27, Number 1, November 1989

Volume 27, Number 2, November 1989

Volume 27, Number 3, January 1990

Volume 27, Number 4, March 1990

Volume 27, Number 5, April 1990

Volume 27, Number 6, May 1990

Volume 27, Number 7, July 1990

Volume 27, Number 8, September 1990