00263nam a2200109Ia 4500100001500000654003000015245004200045260002800087082001800115300000800133546001200141  aGraf R.F.   aEncyclopedia  electronics  aEncyclopedia of  Electronic  Circuits  bB.B.P.aNew Delhic1989  a621.38103 GRA  a760  aENGLISH