00389nam a2200145Ia 450000100060000000800410000602000180004704000130006508200200007810000170009824500580011526000520017330000110022554600070023616831140404s9999 xx 000 0 und d a0-201-54441-5 cPK-LaUMT a 004.019bBAR-U aLon Barfield 4aThe user interface:bConcepts & design.cLon Barfield aChandigarh,India:bAbhishek Publications,c1993 a353 p. aEN