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2. ‘User interface management systems — a current product review’, Report RAL-88-028, Rutherford Appleton Laboratory, , Didcot, England, 1988
3. Cockton, G.: ‘Where do we draw the line? Derivation and evaluation of user interface software separation rules’, Harrison, M., Monk, A., People and computers: designing for usability, (Cambridge University Press 1986), p. 417-431
4. ACM Transactions on Graphics, 1988, 5, (2, 3, 4) (Special Issues)