*Duarte JJ: ''Experiments on an Apparatus Intended to Generate Electricity without Physical Connections to Other Power Sources''. Technische Universiteit Eindhoven [Eindhoven Technical University] Department of Electrical Engineering, Electromechanics and Power
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*Duarte JJ: ''Experiments on an Apparatus Intended to Generate Electricity without Physical Connections to Other Power Sources''. Technische Universiteit Eindhoven [Eindhoven Technical University] Department of Electrical Engineering, Electromechanics and Power. EUT_JD2005_2.doc (7-28-2005).