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Hüttemann, Andreas (2001). Heinrich Hertz and the Concept of a Symbol. In: Symbol and Physical Knowledge, pp. 109-121. Berlin: Springer. ISBN 978-3-642-07474-5
Hüttemann, Andreas (2001). Heinrich Hertz and the Concept of a Symbol. In: Symbol and Physical Knowledge, pp. 109-121. Berlin: Springer. ISBN 978-3-642-07474-5