00290nam a2200109Ia 450000500170000000800410001708200120005810000140007024500450008426000430012930000080017220260224041035.0260224s9999||||xx |||||||||||||| ||und||  a621 JOS  aJoseph E. 0aTheory and problems of electric circuits  aNew York: Mc-Graw-Hill Book Co. c1972  a289