Information control problems in manufacturing technology 1989 : selected papers from the 6th IFAC/IFIP/IFORS/IMACS symposium, Madrid, Spain, 26-29 September 1989 / by Puente, E.A., Nemes, L., IFAC/IFIP/IMACS/IFORS Symposium on Information Control Problems in Manufacturing Technology (6th : 1989 : Madrid, Spain)