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“Tuning Fork Collection Ii, Detail 1”. n.d. Berlin.
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“Tuning Fork Collection Ii, Detail 6”. n.d. Berlin.
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“Brüel & Kjær 2304 Level Recorder (1)”. n.d.
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“Brüel & Kjær 2304 Level Recorder (2)”. n.d.
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“Handmade Paper Waterfall Plot: Mississippi (1)”. n.d.
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“Handmade Paper Waterfall Plot: Beethoven’s 8Th Symphony (1)”. n.d.
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Doegen, Wilhelm Albert. 1927. “Wilhelm Doegen Untersucht Die Kupfermatrize Der Stimmaufnahme Hindenburgs”.
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MPIWG,. n.d. “Tuning Fork 1”. Berlin.
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MPIWG,. n.d. “Tuning Fork 2”. Berlin.
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MPIWG,. n.d. “Tuning Fork 3”. Berlin.