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https://eie.khpi.edu.ua/article/view/2074-272X.2016.2.03/64340 View of LOW-FREQUENCY MAGNETIC FIELD SHIELDING BY A CIRCULAR PASSIVE LOOP AND CLOSED SHELLS magnetic field shielding low frequency view circular passive https://research.polyu.edu.hk/en/publications/principles-of-power-frequency-magnetic-field-shielding-with-flat-/ Principles of power-frequency magnetic field shielding with flat sheets in a source of long... magnetic field shielding flat sheets principles power frequency