Acta Informatica, Volume 28

Volume 28, Number 1, 1990

Volume 28, Number 2, 1990

Volume 28, Number 3, 1991

Volume 28, Number 4, 1991

Volume 28, Number 5, 1991

Volume 28, Number 6, 1991

Volume 28, Number 7, 1991

Volume 28, Number 8, 1991