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Analysis of linear circuits / Clayton R. Paul . New York :  McGraw-Hill Book Co. , 1989 . 792 s . ISBN 0-07-909340-X . [1, of that borrowed 0]

USSR energy efficiency and prospects / Yury Sinyak . Laxenburg :  International Inst. for applied systems analysis , 1991 . S 791 - 815 . [1, of that borrowed 0]