00281nam a2200109Ia 4500008004100000082001500041100001600056245002400072260003900096300001100135650002500146240817s9999    xx            000 0 und d  a517.5 Ys f  aYosida , K. 0aFunctional analysis  c1968a New yorkb Springer -verlag  a465 p.  a Functional analysis