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Morse P. M., 1953, METHODS THEORETICAL, VII, P1325
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MORSE PM, 1953, METHODS THEORETICAL, V2, P1573
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MORSE PM, 1953, METHODS THEORETICAL, V2, P1483
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MORSE PM, 1953, METHODS THEORETICAL, V2, P1466
[9]
MORSE PM, 1948, VIBRATION SOUND, P354
[10]
Stenzel, 1939, LEITFADEN BERECHNUNG