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7 WILL, P.: 'Reactive loads - the big mixer menace', Microwaves, 1971, pp. 38 42

8 MANLEY, J. M., and ROWE, H. E.: 'Some general properties of non-linear elements: Part (1) General energy relations', Proceedings of the IRE, 1956, 44 (7), pp. 904 913

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12 NEMLIKHER, Y. A., and STRUKOV,