Acta Informatica, Volume 27

Volume 27, Number 1, 1989

Volume 27, Number 2, 1989

Volume 27, Number 3, 1989

Volume 27, Number 4, 1989

Volume 27, Number 5, 1989

Volume 27, Number 6, 1989

Volume 27, Number 7, 1989

Volume 27, Number 8, 1989