IFIP TC6 International Conference on Data Communication Systems and The Performance.IFIP TC6 International Conference on Data Communication Systems and The Performance(4th : 1990 : Barcel)：Data communication systems and their performance.IFIP,1991.
IFIP TC6 International Conference on Data Communication Systems and The Performance(4th : 1990 : Barcel)：Data communication systems and their performance
IFIP TC6 International Conference on Data Communication Systems and The Performance.IFIP,1991.
IFIP TC9 International Conference on Human Choice and Computers.IFIP TC9 International Conference on Human Choice and Computers (4th : 1990 : Dublin, Lreland)：Information technology assessment.IFIP,1991.
W. Ehrenebrger,IFIP WG 5.4 Working Conference on Software Products.IFIP WG 5.4 Working Conferences on Approving Software Products (1990 : Garmisch)：Approving software products.IFIP,1990.
